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Black Tourmaline is formed through the crystallization of boron-rich solutions in igneous rocks
This calcite derives its color from manganese impurities
they'll be as beautiful as those in the photos
offering a unique and fascinating glimpse into the Earth's ancient seas
or sedimentary deposits
Rough Obsidian / 1.5-2.5" AVG - 1 KILO LOT Menu wire/spiral wrapped pendants Black Tourmaline is formed throughQuantity: 1 kilogram Average size range: 1. 5 to 2. 5 inches Obsidian is not a gemstone, but instead a kind of glass that forms when volcanic lava rapidly cools in the open air without forming any specific crystalline structures. When polished, obsidian can occasionally exhibit a gold, silver, or rainbow sheen depending on any included minerals.
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