| SPHALERITE, TETRAHEDRITE, QUARTZ, Cerro de Pasco, Peru, 7 x 6 x 4.5 cm | |
 | Here is fine specimen of undamaged Sphalerite crystals. A third of the specimen also has Tetrahedrite crystals which have some blue irridescense. It is from the Gil Griffin (Seattle) collection. |
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