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Coffee-brown staining may be iron
which is known for the nearby Naica locale
The calcite contrasts beautifully with dark veining caused by pyrite
STAINING WARNING: the black matrix is a bit soft
Black tourmaline with albite, smoky quartz, hyalite, and an aquamarine Geode Coffee-brown staining may be ironLocale: Erongo Mountain, Namibia Approx dimensions: 3. 25 x 3 x 1. 75" Approx weight: 417g This large glossy black tourmaline, known as schorl, is accompanied by smaller schorl crystals, smoky quartz, and albite. Some of the smaller schorls have mercedes terminations. It's unclear to me if the main schorl is a single crystal or some product of twinning, but it is a large blocky piece with an offset split through the middle. Erongo schorl typically has
