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    obsidian

    Obsidian 101: Formation and Types

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    michigan-minerals

    Michigan Minerals, Mines & Museums

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    shrine-of-the-grotto-of-the-redemption

    Shrine of the Grotto of the Redemption

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    Quartz Varieties & Forms: On the Rocks

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    rough and broken hallelujah junction quartz

    Hallelujah Junction Mine: Quartz is King

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    tumbled snowflake obsidian with snowflakes that are silicon dioxide polymorph cristobalite

    What is Silicon Dioxide? More Than Quartz

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    salt room used for crystals for health therapies

    Crystals for Health: Wellness Trends

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    watermelon tourmaline on black background

    Watermelon Tourmaline Field Guide

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    complete tabular hexagonal purple-red ruby crystal

    Ruby Gemstone: Field Guide

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    ant-hill-garnets

    Ant Hill Garnets: Tiny Miner Treasures

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