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Any water rushing through the Martian valleys would therefore have to have vanished before the olivine was deposited.
ECONOMIST: Martian chronicles
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The gems are olivine--a mineral class that includes semiprecious peridot--and can range in color from deep green to bright yellow.
FORBES: Hot Rocks
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The latter process occurs at low temperatures when rocks rich in the minerals olivine and pyroxene react chemically with water, releasing methane.
BBC: Martian methane mystery deepens