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Pyrrhotite with Sphalerite and Arsenopyrite

#AH55414

Pyrrhotite with Sphalerite and Arsenopyrite

#AH55414
Availability
Sold
Size
6 x 4 x 3.5 cm - Sm Cabinet 
Formula
Fe7S8 (RRUFF)
Locality
Santa Eulalia, Chihuahua, Mexico
Tagged
sulfide

Mineralogically a cool specimen. There are plates of Pyrrhotite to 1.7mm like the one at the center. To the left of that crystal are black crystals of Sphalerite to 7mm. To the right is a spray of Quartz. Now those little reticulated crystals are prismatic Arsenopyrite, which are epitaxially oriented. Also in the hood are saddle shaped Siderite crystals and Galena which can be seen on the backside, though are not crystallized but granular. 

Pyrrhotite

Formula
Fe7S8 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Platy, Massive - Granular 
Cleavage
Imperfect, Imperfect, None 
Luster
Metallic 
Color
bronze, bronze red, dark brown 
Streak
gray black 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 

Data courtesy of Webmineral.

Collection
Arnold G Hampson Collection

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