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Sphalerite (Spinel Law twinned crystals) from France Stone Co. Quarry, 4.8 km east of Logansport, Cass County, Indiana

 
Sphalerite (Spinel Law twinned crystals) from France Stone Co. Quarry, 4.8 km east of Logansport, Cass County, Indiana

Sphalerite (Spinel Law twinned crystals) from France Stone Co. Quarry, 4.8 km east of Logansport, Cass County, Indiana

Sphalerite (Spinel Law twinned crystals) from France Stone Co. Quarry, 4.8 km east of Logansport, Cass County, Indiana

Sphalerite (Spinel Law twinned crystals) from France Stone Co. Quarry, 4.8 km east of Logansport, Cass County, Indiana

Sphalerite (Spinel Law twinned crystals) from France Stone Co. Quarry, 4.8 km east of Logansport, Cass County, Indiana

Sphalerite (Spinel Law twinned crystals) from France Stone Co. Quarry, 4.8 km east of Logansport, Cass County, Indiana

Sphalerite (Spinel Law twinned crystals) from France Stone Co. Quarry, 4.8 km east of Logansport, Cass County, Indiana

Sphalerite (Spinel Law twinned crystals) from France Stone Co. Quarry, 4.8 km east of Logansport, Cass County, Indiana

Sphalerite (Spinel Law twinned crystals) from France Stone Co. Quarry, 4.8 km east of Logansport, Cass County, Indiana

Sphalerite (Spinel Law twinned crystals) from France Stone Co. Quarry, 4.8 km east of Logansport, Cass County, Indiana

DESCRIPTION:No. 75733
Mineral:Sphalerite (Spinel Law twinned crystals)
Locality:France Stone Co. Quarry, 4.8 km east of Logansport, Cass County, Indiana
Description:Superb cluster of large lustrous dark sphalerite crystals that exhibit yellow translucency under strong illumination. The sphalerite crystals are repeatedly twinned on the octahedral {111} plane following the Spinel Law of isometric twinning. From my personal collection; ex. Steve Chamberlain collection #2716; originally acquired in 1980 from George Robinson. See: Indiana Minerals, A Locality Index in Rocks and Minerals v.61 #3
Overall Size:5.5x5x4 cm
Crystals:3-25 mm
Status: Sold - Posted here for reference only
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