Tourmaline, Schorl cluster - Minas Gerais, Brazil (MS2902m)

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Discrete Tourmaline crystals have inter-grown into a nice palm-sized specimen weighing about 90 grams and measuring about 75mm x 40 mm x 20mm.  Encrusted with other minerals, such as feldspars and micas adding contrasting color.  The yellow cube is a typical bouillon cube, measuring about a half-inch on a side, photographed for size reference.