Tourmaline, Schorl cluster - Minas Gerais, Brazil (MS2902e)
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Several Discrete Tourmaline crystals have inter-grown into a golf-ball-sized specimen weighing about 70 grams and measuring about 40mm x 40 mm x 30mm. 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.