Olivine, a Semiprecious Stone

The dark-green spots on these stones are the mineral olivine, or peridot. Olivine is special. Geophysicists believe olivine was the first mineral to form on a young Earth. Finding olivine-bearing rock where I live is extra-special. Olivine is igneous in origin. At the south end of Lake Michigan, bedrock is very deep sedimentary. No volcanoes... Continue Reading →

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