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with variations in shades depending on the amount of lead and other minerals in the crystal
depending on the specific composition of the stone and its surface finish
NO color selection
4 grams per cubic centimeter
Black Tourmaline - Brazil - 10 pounds Green with variations in shades dependingMixed Sizes. Mostly multiple pieces per pound. Local: Brazil 1. Color: As the name suggests, black tourmaline typically exhibits a deep black color, although it can sometimes have a slight brownish tint. It often occurs in long, prismatic crystals, but can also be found in massive formations. 2. Hardness: Black tourmaline has a hardness of 7 to 7. 5 on the Mohs scale, making it relatively durable and resistant to scratching. 3. Clarity: Black
