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0 item @ $0.00  

Gahnite with Pyrite

#PD45786

Gahnite with Pyrite

#PD45786
Availability
Sold
Size
6.5 x 4 x 4.5 cm - Sm Cabinet 
Formula
ZnAl2O4 (RRUFF)
Locality
Davis Pyrite mine, Rowe, Franklin Co., Massachusetts, United States

This may look like a homely specimen, and it is, but it comes with an old label with the date written as 3/23/34. The Davis Pyrite mine was a of stratabound massive sulfide deposit. They are dark bluish black and form crude stepped octahedral crystals, which are roughed up a bit. They are also hard, about 7.5, as it should be since it is a spinel with zinc. The matrix is mostly Pyrite and Quartz. See the prov. tab for a scan of the label. You should probably own a piece of history.

Gahnite

Formula
ZnAl2O4 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Massive - Granular, Striated 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
bluish green, grayish green, deep leek green, greenish black, bluish black 
Streak
gray 
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness

Data courtesy of Webmineral.

Collection
Phillips Collection
Mineralpedia
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