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This important pegmatite mineral has a shiny metallic luster when tilted in the light
An amazing geologic treasure over a BILLION years in the making
this rare variety of trilobite was preserved in incredible detail
The bright brass coloration
surrounded by some amazing copper-mineralization
Rainbow Pyrite Concretion - Russia LIVE This important pegmatite mineral hasA spire of sparkle and color in this "Rainbow" Pyrite specimen from Ulyanovsk, Ulyanovsk Oblast, Russia. The rainbow colors are completely natural, and are a result of oxidization of the pyrite, sometimes referred to as Rainbow Pyrite. They form inside hard concretions found along river beds in Russia. The gray and earth tone exterior looks like an ordinary rounded rock when first unearthed. The concretions must then be cracked open (similar to a
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