Thursday, March 31, 2011

Geological Fact of the Month - March





You can find any other Geological Fun Facts over at my website.

8 comments:

  1. Would that also be in terms of mass? Or would that go to iron/nickel? Kind of interesting to think of the crust as the weathering rind on a giant lump of peridotite.

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  2. That's not the most common mineral on Earth; it's the most common mineral in the Earth...

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  3. Well in terms of the Iron/Nickel, I think since most of the core is molten it doesn't qualify as a mineral. But for the solid part perhaps.

    And I think the "on vs in" is a matter of semantics. If you asked how many caves were on Earth you also wouldn't be technically correct since they are located in the Earth.

    I think of "on" as including the entire Earth, not just the surface, but that is my personal viewpoint.

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  4. Surely it is silicate perovskite as the lower mantle is larger by volume than either the upper mantle or core.

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  5. Actually I looked into the Perovskite issue based on your AW post and I am not convinced it actually is a mineral. Everywhere I look it is just listed as a crystal structure (even my Minerology textbook). Although that is why I put "is generally regarded" because I knew there was some disagreement.

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  6. If graphite and diamond are separate and distinct minerals then surely olivine, beta-spinel, gamma-spinel (ringwoodite?), and silicate perovskite are.

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  7. If I get this right, is it basically like saying that the most common mineral "in" Earth is Olivine variety silicate perovskite? And why is it "silicate" perovskite and not just perovskite?

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  8. An update to this post can be found at http://jazinator.blogspot.com/2014/07/geological-fact-update-on-most-common.html

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