Black Tourmaline A cut base frequently in combination with zeolites

frequently in combination with zeolites like apophyllite or as pseudomorphs after laumontite

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Septarian are carbonate rich concretions containing angular cavities and cracks filled with hardened material

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Black Tourmaline A cut base frequently in combination with zeolitesBlack Tourmaline, scientifically known as Schorl, can originate from the crystallization of molten rock deep within Earth's crust. It has a hardness of 7 7. 5 on Mohs scale with a trigonal crystal structure. The black color is often due to the presence of iron impurities within the crystal structure. This particular specimen is from Namibia, South Africa. Measuring . 6 inches in height, 1. 2 inches in length, and 1 inch in width. Weighing 1. 2 ounces.