#Theyre pretty common in mantle xenoliths if they dont break down into serpentine
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Peridot (just) (IDK how many are pornbots)
where is the old tumblr gem post i need to compare my follower count now
#Did you know? Peridot is a gemstone form of peridotite#and peridotite is the olivine mineral that composes the bulk of the upper mantle#peridotite like other olivines is an iron-magnesium tetrasilicate mineral ith the Mg2+ and Fe2+ ions being interchangeable in the matrix#Theyre pretty common in mantle xenoliths if they dont break down into serpentine#though serpentinised olivines do look really pretty
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