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Geology/minerals and temperature history

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Question
QUESTION: Dear Meisam,

Can you tell me at what temperature following minerals crystallize?
Quartz
Calcite
Pegamtite
Mica
Pyrite
Chalcopyrite
Gypsum
Anhydrite
Salt

Thanks

ANSWER: Dear Tariq,

Melting, freezing, and crystalization temperatures are only valid for pure substances. These minerals form in a variety of temperatures, pressures, and chemical compositions. It highly depends on the environment of their formation and ambient conditions. For example, calcite can crystalize from magma, can be a hydrothermal mineral, or can crystalize at ambient temperatures in oceans.
Whenever a mineral reaches saturation point it crystalizes.

---------- FOLLOW-UP ----------

QUESTION: Thanks for answering me. Can you give me the range of temperatures of each mineral? If we get a calcite crystal in a well at 5km depth can we assume the maximum temperature the calcium carbonate fluids reached before converting crystalline calcite?

Answer
You can find the range of temperatures or pressures one particular mineral has formed in that particular conditions. But you have to consider the position of paleo-surface. The current depth observable for a mineral deposit might not be that when the mineral was formed.

Geology

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Meisam Rasouli Beirami

Expertise

Magmatic Ore deposits; Igneous Rocks; Uranium Ore Deposits; Mississippi Valley Type (MVT) Deposits; Remote Sensing; Satellite Imagery Processing;

Experience

I have done a thesis on magmatic uranium deposits. I ma currently working on MVT ore deposits and their exploration via satellite imagery.

Organizations
Shiraz University, Shiraz, Iran Golestan University, Gorgan, Iran

Education/Credentials
Bachelor's degree of geology: Tehran university, Iran. MSc of economic geology: Gorgan university, Iran. PhD student of economic geology: Shiraz university, Iran.

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