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Franckeite

#PD34232
SOLD
Franckeite from Kalkar quarry, Santa Cruz Co., California, United States - PD34232
Franckeite from Kalkar quarry, Santa Cruz Co., California, United States - PD34232

Franckeite

#PD34232
Availability
Sold
Size
3 x 5 x 2.5 cm - Miniature 
Formula
Fe2+(Pb,Sn2+)6Sn4+2Sb3+2S14 (RRUFF)
Locality
Kalkar quarry, Santa Cruz Co., California, United States
Tagged
sulfide

Slivery platy Franckeite crystals, with an undulating striated appearance, throughout sulfide rich Calcite/Limestone matrix.

I'm going to venture a guess that these don't come around on the market too often and this is a nice piece!

Franckeite

Formula
Fe2+(Pb,Sn2+)6Sn4+2Sb3+2S14 
Crystal System
Triclinic 
Crystal Habit
Tabular, Massive - Fibrous, Radial 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
grayish black, blackish gray 
Streak
grayish black 
Class
Triclinic - Pinacoidal 
Fracture
Flexible 
Hardness
2.5 

Data courtesy of Webmineral.

Collection
Phillips Collection
Mineralpedia
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Previously Sold Franckeite
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WebMineral
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