The Petoskey Stone for #ThinSectionThursday. The Michigan state stone, this ~400 million year old coral has been replaced by quartz. Our thin section is thick at 100 microns so the quartz is more colorful than normal. #fossils #geology
— Terra Persona (@terrapersona) September 6, 2018
Learn more and shop: https://t.co/w3HPXOmfSV pic.twitter.com/tW8hq9qsFx
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September 07, 2018 at 03:17AM
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