Tourmaline, Schorl cluster - Minas Gerais, Brazil (MS2902f)
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Discrete Tourmaline crystals have inter-grown into a nice palm-sized specimen weighing about 70 grams and measuring about 50mm x 30 mm x 20mm. Nice luster. Other minerals, such as feldspars add contrasting color. The yellow cube is a typical bouillon cube, measuring about a half-inch on a side, photographed for size reference.