brachiopod fossil fine grain gray sandstone rock shell fossils the permian period |
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| navigate by keyword : background become big black brachiopod carbon cemented coal collection crystal decoration finegrain fossil fossils fuel garden geology grains granite gray grow isolated macro material mica mine mineral mining natural nature object ore outdoor period permian piece rock rough sandstone shell solid stone together white |
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| A rock is a solid collection of mineral grains that grow or become cemented together. |
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