An absolutely pristine ball of California artinite (Zinn Coll. #1077). Artinite is a rather rare and lesser-known carbonate mineral (though it LOOKS a lot like some well-known zeolite minerals) that sometimes forms these perfect balls of radiating, fibrous crystals. Its chemical formula is Mg2CO3(OH)2 + 3H2O (Hydrated Magnesium Carbonate Hydroxide). HUGE ball of artinite here!
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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