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Question:

What mineral species are less dense than water? One is evenkite, what is the other one?

What mineral species are less dense than water? One is evenkite, what is the other one?

Answer:

I'm gonna say clathrates- or, methane hydrate. There appear to be a couple of molecular arrangements, but this is the crystalline form of methane that exists in the deep ocean.like below 50 atmospheres, at 4-5 degrees C. It's SG is 0.95. Initially, I didn't think it was a mineral, strictly speaking, since our definition of mineral stressed inorganic.back in the Pleistocene when I took Mineralogy. But I saw where your evenkite is a crystalline hydrocarbon too, and proceeded from there. Webmineral, it turns out, lists all manner of so-called hydrocarbon minerals, organic compounds, etc. I'll have to dig out venerable old Klein and Hurlbut. I gotta go back to school.
Ice. Yes, ice is a mineral.

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