Mineral Specimen #4987 Sphalerite variety: Marmatite
Vtoroy Sovietsky Mine, Dalnegorsk, Russia
This specimen is an unusual, highly modified, complex, elongated Spahlerite crystal. The color is jet black and has the surface have a high, glossy luster.
Flaws: Two surfaces are cleavage planes - best seen in the upper left of the specimen in the third photo.