| Subject | Date Asked |
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| Geology--Earthquakes in Subduction Zones | 11/18/2009 |
Q: Why do the deepest earthquakes occur on subduction zones?
A: Think of the surface of the earth as pieces of flexible foam (continental plates)floating in a ...
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| Horizontal drilling | 11/8/2009 |
Q: Norris My question is: In which geologic conditions it is recommended to use horizontal drilling? ...
A: Horizontal drilling has little or any geologic concern. Horizontal drilling is mostly if not ...
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| obsidian | 10/30/2009 |
Q: I am preparing a homework regarding obsidian rocks.An I would like to know if the obsidian rocks are ...
A: Obisidian was used by Aztecs for the sharp points of their weapons, mirrors, masks, and for ear ...
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| geology | 10/14/2009 |
Q: what is the relationship that can occur between a body of igneous rock and economic mineralisation.
A: This is not a simple question. That is exactly what economic geology is and what I do. To ...
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| Rock Identification | 9/24/2009 |
Q: I found this rock nearly a year ago now. I believe it to be some sort of copal but that is as far as ...
A: First I apologize, I didn't realize that you had sent another picture of the rock and therefore I ...
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| Rock Identification | 9/23/2009 |
Q: I found this rock nearly a year ago now. I believe it to be some sort of copal but that is as far as ...
A: That is a very bazaar and beautiful picture. If you would send me another picture taken with the ...
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| Formation of the Sierras & gold | 9/23/2009 |
Q: 2 questions of wording for a history programme we are making: Is there a more exciting and easier ...
A: I'm not a writer but a geologist. Geology has certain terms that describe formation to geologists. ...
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| identify this rock | 9/22/2009 |
Q: i have rock i would like some information on outer layer can only scratch with knife inner rock ...
A: I can not see the scratches well but they were probably formed from one of three ways. 1) There ...
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| i have a second rock | 9/22/2009 |
Q: i have a second rock similar to first but different outer layer can be scratch with fingernail ...
A: If the rock was found loose (not-in-place), particularly in a stream, it probably came from ...
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| i have a second rock | 9/22/2009 |
Q: i have a second rock similar to first but different outer layer can be scratch with fingernail ...
A: Without actually having the rock in my hand I can not give you a definitive answer but I will try ...
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| identify this rock | 9/22/2009 |
Q: i have rock i would like some information on outer layer can only scratch with knife inner rock ...
A: Again without actually having the rock in my hand it is very difficult to give you a definitive ...
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| Question | 9/21/2009 |
Q: I studied from many resources that continents are continously moving. Now what makes these ...
A: In geologic time continental movement as fast as our fingernail grow (1/4/inch a year) is extremely ...
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| Identification of rocks and minerals | 9/9/2009 |
Q: I have a few samples of rocks here at my house I've been trying to find out names for. I was hoping ...
A: For me to even make an attempt at telling you what kind of rock that you have, you need to do a few ...
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| five pound agette? | 9/7/2009 |
Q: we found this around five pound big chunk marbled tan and creams with some clear spots. its smooth ...
A: Yes it would be a lot easier if I could see pictures but I will try my best. You could send a ...
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| obsidian | 9/7/2009 |
Q: how much are my 10 obsidian 20mm rocks worth
A: Obsidian is black. The "rocks" in the picture appear clear and exactly the same size unless the ...
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| a rock formation? | 9/6/2009 |
Q: The photo is from the top of a mountain in the Adirondacks (NY). The area is almost all granite, ...
A: Without seeing the rock in person it is difficult to tell you for sure what the bluish-gray rock is ...
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| Anything? | 9/4/2009 |
Q: Are these of any worth in any market? I found them near my house on farms and across the street ...
A: The black coating is pyrolucite (MgO2) and is a secondary mineral of the host rocks. This means ...
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| What the? | 9/2/2009 |
Q: I have been going on long walks around my house and area to look for rocks and things I just can't ...
A: I am probably not going to be able to answer you question satisfactorily but I will do my best. My ...
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| us coal | 8/26/2009 |
Q: what is the biggest mine in us
A: The Black Thunder thermal coal mine, located in the Southern Powder River Basin of Wyoming, opened ...
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| rock my father in law found | 8/8/2009 |
Q: my father in law found this rock on his property and at first thought it was hematite until it did ...
A: For me to even make an attempt at telling you what kind of rock that you have, you need to do a few ...
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| geology | 8/4/2009 |
Q: How do geologists in the field find clues about the distribution of rock types?
A: As a geologist you should do your homework before going into the field. By homework I mean that you ...
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| difference between supergene porphyries and associated volcanic rocks | 8/3/2009 |
Q: I have difficulties on distinguishing supergene porphyries and associated volcanic rocks through ...
A: I realize that this question is directly related to your studies and with some effort I might be ...
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| um, jewlery question.... | 8/3/2009 |
Q: Sorry this isn't an insightful question and probably not a great use of your time. But I saw this ...
A: There are several pink gemstones. I have attached a site that shows some of these: ...
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| Rock ID | 7/26/2009 |
Q: I would like to send you some samples of a type rock that I have been finding in michigan. I am ...
A: I will attempt to tell you what the rock is; however, I need to know as precicely as possible where ...
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| what is it? | 7/26/2009 |
Q: This material is silver, very hard, metallic, inside is somewhat porous, has a scattered smooth/flat ...
A: For me to even make an attempt at telling you what kind of rock that you have, you need to do a few ...
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| Iron Minerals | 7/10/2009 |
Q: Does all stones contain iron minerals to some extent?
A: No, in fact iron (Fe) is rather far down on the scale at number 4 and composing about 5% of the ...
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| precious minerals | 6/28/2009 |
Q: My son lives in a rural part of connecticut. He and my grandsons have found rocks, soil,etc. that ...
A: For me to even make an attempt at telling you what kind of rocks that you have, you need to do a few ...
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| mineral constituent of metamorphic rock | 6/10/2009 |
Q: please tell me the mineral constituents present (in percentage) in gneiss, ...
A: I can not answer your question but I will try to tell you why the question is un-answerable. ...
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| rock identification | 5/25/2009 |
Q: I want to know what kind of rock i have. Its very smooth, with different colors of light and dark ...
A: I feel even more storngly that your rock is a banded agate, after viewing the picture. I have ...
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| rock identification | 5/24/2009 |
Q: I want to know what kind of rock i have. Its very smooth, with different colors of light and dark ...
A: For me to even make an attempt at telling you what kind of rock that you have, you need to do a few ...
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| About the brief of ruby & sapphire | 5/18/2009 |
Q: Please answer to me about the brief of ruby and sapphire for the entrance exam of Myanmar ...
A: There are many books about mineralogy, I personally have several but my favorite is ROCKS & MINERALS ...
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| geology | 5/14/2009 |
Q: what is the economic importance of sokoto basin in nigeria
A: I have worked in many countries but not Nigeria; however, I will make an attempt to answer you ...
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| Rock origin - Is it a Kimberlite? | 5/12/2009 |
Q: Recently, I learned that our 25 acres of land is categorized as a Kame Terrace with many debris flow ...
A: This rock is not a kimberlite. I am away from home and do not have my petrology book with me; ...
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| convergent plate boundaries | 5/7/2009 |
Q: What are some of the economically important rocks and minerals that form at convergent plate ...
A: I could give you an answer but the one found at the inserted site is much better than mine. ...
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| What is this rock? | 5/6/2009 |
Q: I have a rock that is silver in color, heavy for it's size (17.5 lbs), and when we chipped a piece ...
A: This rock is a sulfide which means that it is a metal combined with sulfur. My first guess is ...
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| Sedimentary stone, AKA Flagstone. | 5/6/2009 |
Q: I am from northeastern Pennsylvania, Susquehanna county. I've taken notice to a response that was ...
A: Mica minerals are an essential constituents of various igneous rocks, such as granite, metamorphic ...
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| Sedimentary stone, AKA Flagstone. | 5/5/2009 |
Q: I am from northeastern Pennsylvania, Susquehanna county. I've taken notice to a response that was ...
A: I can not tell, from the picture, exactly what type of rock that you are quarrying but since you ...
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| Earth Science | 5/4/2009 |
Q: What are the types of plate boundary interactions? What is the evidence for plate movement? How are ...
A: I am an economic geologist not a structural geologist or a geomorphologist. I have tried to answer ...
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| Earth Science | 5/3/2009 |
Q: What are the types of plate boundary interactions? What is the evidence for plate movement? How are ...
A: PLATE BOUNDARIES Plate boundaries are found at the edge of the lithospheric plates and are of three ...
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| epicenters | 5/1/2009 |
Q: what two closest epicenters and the dates of their last earthquake. what is the magnitde of the ...
A: The last earthquake to occure in Ohio was on Friday, April 24, 2009 at 09:42:46 AM. The earthquake ...
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| about my rock | 4/30/2009 |
Q: can you help me to identify the rock that i found,i try to scratch it using a knife and window glass ...
A: It is often difficult to tell much about a rock from a picture but the picture that you sent shows ...
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| Rock? | 4/29/2009 |
Q: I was wondering what kind of rock this is. It was found in central California.
A: The picture is not very good; therefore, I can't tell much about the rock but just from the general ...
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| diomond formation | 4/27/2009 |
Q: can you tell me how the diomonds are formed ,in what kinds of rocks it is formed,about ...
A: The conditions for diamond formation, to happen in the lithospheric mantle, occur at considerable ...
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| regarding the kind of stone i have | 4/25/2009 |
Q: I found a stone while digging a well in tamilnadu [India]. it weighs about 14.5 grams and appears ...
A: Naturally occurring colorless rocks are relativly common and are basically what glass is made from. ...
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| Meteor impacts | 4/22/2009 |
Q: Driving through the southern end of the Rockie Mountains/Sangre De Christo mountain range there ...
A: I have reached the limit of my knowledge about the specific ancestry of the Rockies. I am an ...
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| Meteor impacts | 4/20/2009 |
Q: Driving through the southern end of the Rockie Mountains/Sangre De Christo mountain range there ...
A: The Laramide orogeny was a period of mountain building in western North America, which started in ...
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| GOLD ORE | 4/15/2009 |
Q: IF GOLD ORE IS DETECTED IN ROCK, AND YOU PULVERISE THE ROCK DOES OR CAN GOLD BREAK AND CAN THE GOLD ...
A: You have several questions that I will try to answer independently. If gold ore is detected in ...
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| Akermanite Ca2MgSi2O7 | 4/10/2009 |
Q: I found these strange looking rocks late last summer and had them analyzed by x-ray diffraction and ...
A: Åkermanite (Ca2Mg[Si2O7]) is a melilite mineral of the sorosilicate group, containing calcium, ...
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| gold in delaware | 4/5/2009 |
Q: i was just wondering if there is eny gold or gems in delaware?i know that there is in all the states ...
A: You are right - to the best of my knowledge Delaware has not known gold; however, this does not mean ...
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| Rock identification | 4/2/2009 |
Q: I found this rock in my back yard in SW Washington state. The rock aprox 2x2x1 inches. The rock is ...
A: From the picture and your description the rock can only be Hematite Fe2O3 (Fe 70% & O 30%). ...
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| geology of Thessaly Greece | 3/29/2009 |
Q: I am curious as to the geology of thessaly in N. Greece. I'm writing a book based in that region. ...
A: I am not familiar with Thessaly Province of Northern Greece so I went on-line and found what appears ...
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| Age of salt deposits | 3/24/2009 |
Q: "Himalayan salt" - it cures your ills and purifies your air(?). It makes pretty lamps. What is the ...
A: which began being sold by various companies in Europe, North America, and Australia in the early ...
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| volcanoes | 3/24/2009 |
Q: what causes there to be different kinds of volcanoes? Does the type of magma or type of crust on the ...
A: Geologists generally group volcanoes into four main kinds--cinder cones, composite volcanoes, shield ...
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| Identify a rock/mineral | 3/23/2009 |
Q: I have this necklace with a large polished translucent stone and am curious as to the type of stone ...
A: That is a beautiful necklace but I am afraid that I can not identify the mineral type from the ...
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| Questions regarding rocks and gemstones | 3/17/2009 |
Q: my name is Bry and I am working on a school project about rocks, fossils, and gemstones. I was ...
A: Yes Bry I can help you out on most of your questions. Your question about "How are rocks formed ...
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| shiny rock | 3/12/2009 |
Q: i have a mine in my back yard and it has this flaky rock that can see yourself almost through the ...
A: Mica, again, is a very common rock in quartz; particularly pegmatites. If the material in the rock ...
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| shiny rock | 3/11/2009 |
Q: i have a mine in my back yard and it has this flaky rock that can see yourself almost through the ...
A: It is probably one of the many types of mica. The two most common types are muscovite and biotite. ...
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| What rock is it??? | 2/27/2009 |
Q: Hey i just have a quick question. Can you tell me what rock this might be; it is a black metalic ...
A: No I can not tell you what the rock is but mica is not metallic looking and neither schist or gniess ...
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| Geology | 2/24/2009 |
Q: What radioactive decay involves the release of an electron?
A: The three types of nuclear radioactive decay are alpha, beta and gamma emission. An alpha particle ...
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| Obsidian | 1/24/2009 |
Q: I have read on obsidian and I found it quite interesting. I will like to know more about obsidian, ...
A: I'm sure that you can find many good web site but in general the more technical sites are university ...
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| rock identification. | 1/23/2009 |
Q: i have asked a bunch of rock folk near my home in vancouver and where i found the rock in nevada and ...
A: I have done some work in Nevada and am somewhat familiar with the general geology there but it ...
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| Rocks & Mineral | 1/22/2009 |
Q: I am taking Earth System Engineering Course and I am interested in rocks & minerals. Could you ...
A: I suppose this depends on your level of interest. Dana's Manual of Mineralogy is in my opinion the ...
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| earthquake | 1/8/2009 |
Q: Q6.How does the distribution of eathquake foci correlate with plate boundaries? Q7.What kinds of ...
A: It is very evident that you are extremely knowledgeable about plat tectonics; probably more so that ...
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| earthquake | 1/7/2009 |
Q: Q6.How does the distribution of eathquake foci correlate with plate boundaries? Q7.What kinds of ...
A: I am not a volcanologist however I will make an attempt at answering your questions with my limited ...
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| Trying to id rock | 12/21/2008 |
Q: I am trying to find out what this rock is that I found. Agate, Mineral, fossil? Any information ...
A: In order to make an attempt at identifying the rock I need to know a few things about the rock. 1) ...
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| vanessa | 12/17/2008 |
Q: what occurs at a deep-ocean trench?what type of plate boundary is a deep-ocean trench?describe what ...
A: The Earth's rocky outer crust solidified billions of years ago, soon after the Earth formed. This ...
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| Question | 12/13/2008 |
Q: I want to ask a question that do mountains really prevdnt earth from shaking (Not earth quake a ...
A: I'm not real sure that I understand the question but I will attempt to answer it as I understand it. ...
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| science | 12/9/2008 |
Q: what was the earliest form of life?
A: This is an excellent question and one that we, as geologists, know that we can not answer correctly; ...
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| coal formation | 12/3/2008 |
Q: Is Charcoal a type of real coal? Did it form from the processes that made coal or is it wood that ...
A: Charcoal is the blackish residue consisting of impure carbon obtained by removing water and other ...
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| radiometric dating | 11/23/2008 |
Q: I'm just a lay person, no expertise at all. I'm just curious about radiometric dating. I've read a ...
A: I'm not exactly sure about your question relative to what "original state" means but I will tell ...
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| structure in New Mexico, near mexican border | 11/23/2008 |
Q: Sitting between Cloverdale, N.M. to the northwest and El Valle, Mexico to the southeast there ...
A: Even though I have done some work in NM it has been many years and have only worked in a few ...
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| science | 11/13/2008 |
Q: i would like to know some information about the Charleston Earthquake? 2. i would also like to know ...
A: This earthquake occurred August 31, 1886 and was a magnitude of 7.3. It was the most damaging ...
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| rocks | 11/2/2008 |
Q: During vacation time I picket up rocks on the floor at the following sites from Etna Volcano(Italy), ...
A: As a general rule most rocks are not affected by short exposures to soap and water; however, there ...
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| Metallic rock | 10/31/2008 |
Q: A relative has found a metallic rock/stone underground in the mountains in volcanic soil in the ...
A: I need for you to answer a few questions concerning the rock. Hardness: can you scratch it with ...
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| what is it | 10/11/2008 |
Q: i found a rock and its outside is silver gray and its heavy for its size the inside is crystalline ...
A: Randy, From your information, which by the way is very good, I can narrow the mineral (rock) down ...
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| help me!!!!!!! | 10/8/2008 |
Q: What is the Earth's mantle. outer core, and inner core made of. [composition]
A: Briana, The planet Earth is made up of three main shells: the very thin, brittle crust, the mantle, ...
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| minerals | 9/22/2008 |
Q: can you tell me what is solidification of a melt? what is precipitation from solution? what is ...
A: What is solidification of a melt. The word solidification means becoming solid. The best way to ...
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| What Type of Rock Is It? | 9/19/2008 |
Q: Can you shed some light as to what type of rock I have. It looks like it may have been exposed to ...
A: It is very difficult to determine, from a picture, a rock type but I will do my best. In ...
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