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Prehnite is a semi-brittle gemstone that often forms as globules
These impurities activate in response to natural geological radiation over time
Polished Amethyst Druzy Heart on Metal Stand
Product contains many different stone types from all over the world
The specific shade of green depends on the amount of iron present in the crystalline matrix
Elite Shungite Rough Crystal / 121-150g AVG - 1 PIECE rough stone sale Prehnite is a semi-brittle gemstoneQuantity: 1 piece Average size range: 121 to 150 grams Shungite is an extremely carbon rich mineraloid, meaning that it shares many qualities with other minerals but does not have an underlying crystalline structure. Containing 98% carbon by weight, most shungite deposits have been found in Russia, with other deposits occurring in other parts of Europe and Asia. The oldest deposits have been dated to approximately 2 billion years ago.
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