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About C. Robert Reszka, Jr.
Expertise
I can answer any general geology question (rocks, minerals, stratigraphy, geomorphology etc.). My expertise is in the geology of the Michigan Basin, PreCambrian, Paleozoic and Recent. I can answer questions concerning mining and petroleum exploration and production and the laws concerning those activities. I can also answer questions concerning stratigraphy of the Michigan Basin. I will also answer questions about mineral and rock collecting in the Basin. I won`t be able to answer many specific questions on hydrology, geophysics or geochemistry. I may be able to answer very general questions in those venues.

Experience
I have been working for the State of Michigan for 24 years as a Geologist and a Resource Analyst. I have experience with Subsurface Geology and Petroleum Geology, mining in Michigan, and Sand Dune Mining and Protection issues.

Organizations
Michigan Basin Geological Society

Publications
Decade of North American Geology.
Bedrock Geology of Michigan

Education/Credentials
BS Wayne State University

You are here: Experts > Science > Geology > Geology > strange rock

Geology - strange rock

Expert: C. Robert Reszka, Jr. - 10/26/2009

Question
I found a rock in a field in southern Quebec that is different than anything I have ever seen before. Everyone that I show it to says the same. The exterior is a burn't black/brown, the interior is slightly rusted, it's very heavy for it's size, magnets stick to it, and it has light green, web like lines all over it. It split open along the lines.The lines are what you notice the most. I've been told that it is not a meteorite, but would like to know exactly what it is.

Answer
Hi David,
I'm really going to need to see a picture to get a better idea of what you have. Not too many rocks are magnetic and none I can think of have a web of green lines over it. Without seeing it, but from your description; "black/brown" exterior, "slightly rusted" interior, heavy for it's size, and it's being magnetic, all lead me to believe it isn't a rock but a piece of metallic slag. I have seen many pieces like you describe, except for the lines. Since you are in Quebec perhaps it made it's way, who knows how, from an ore freighter from the Great Lakes.

I don't know. If you send me a picture I might be able to tell better. If you do take one make sure it has something in the frame that will give me an idea of it's size, a coin will do. Also, tell me where you found it, can you scratch it with a knife, will it cut glass, if you hit it with a hammer does it ring?
I'll look for another question from you if you take a picture.
Hope this helps.
Bob

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