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Sphalerite - Joplin Field, Tri-State District, Jasper Co., Missouri, USA
(#:MINS7874)
Gem, highly lustrous, ruby-jack sphalerite crystals with shocking flashes of reddish-orange and yellow color cover the matrix on this superlative, old-time specimen from the famous Joplin Field. The gemminess, color and quality of these crystals are top-notch for the locale and are very rarely seen on the market. The entire field of sphalerites is gemmy. This is very old-time material dating to the 1950s or much earlier. Ex.Francesco Bedognč collection.
Formula :
ZnS
System:
cubic
Hardness:
3½-4
Rarity:
not common
Strunz id:II/C.1-10 - SULFIDES
Name origin:
Named in 1847 by Ernst Friedrich Glocker from the Greek σφαλεροζ "sphaleros" = treacherous, in allusion to the ease with which dark varieties were mistaken for galena, but yielded no lead. Originally called blende in 1546 by Georgius Acricola (Georg Bauer). Known by a variety of chemical-based names subsequent to Agricola and before Glocker including "zincum".
Specimen weight:32 gr.
Crystal size:Up to 1,2 cm long
Overall size: 80mm x 57 mm x 30 mm
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