Tourmaline, Schorl cluster - Minas Gerais, Brazil (MS2902a)
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Discrete Tourmaline crystals have inter-grown into a large hand-sized specimen weighing about 190 grams (near a half-pound) and measuring about 65mm x 50 mm x 30mm. Other minerals, such as feldspars add contrasting color. The yellow cube is a typical bouillon cube of about a half-inch on a side, photographed for size reference.