Mantle Gems Ooh . . . Shiny!

Guest Video: Peridot, A Mantle Gem

Diamonds aren't the only mantle-associated gems. Most of the upper mantle is made out of peridotite, a combination of olivine and pyroxene. It is named after the very famous gemstone it contains--peridot.


Did you know that many diamonds form underneath continents on a “mantle keel”?

These beauties aren’t the only mantle-associated gems.

Most of the upper mantle is made out of peridotite, a combination of olivine and pyroxene. It is named after the very famous gemstone it contains–peridot.

Combined with diamonds, peridot made a beautiful addition to early 19th century Habsburg royal jewels.

Peridot usually reaches the surface through volcanism, but this gemstone mineral has also been found in meteorites and even in comet dust.

The space connection isn’t surprising when you consider that the mantle makes up over 80% of our planet, which formed out of a space dust cloud.

Here are some people in Australia collecting peridot that had a “homey” origin in our planet’s mantle.


Featured image: Aomai CC BY-SA 3.0.


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About BJ Deming

After getting an associate's degree in forestry, I studied geology as an undergraduate back in the 1980s but went into medical transcription instead. It just worked out better for me. The Internet renewed my interest in geoscience as a hobby, and when I retired in 2014, I decided to write a book about cat evolution. That started a new career for me (enormous fun but not self-supporting yet). Right now, besides blogging I am finishing up the first two books in a self-published ebook series about the cat family and its history. Thanks for your interest!

3 comments on “Guest Video: Peridot, A Mantle Gem

  1. I love peridot! 💝

  2. Pingback: Zabargad: Island of Green Stones | Flight To Wonder

  3. Pingback: Metamorphic Gem: Garnet | Flight To Wonder

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