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0 item @ $0.00  

Franckeite

#RS59030

Franckeite

#RS59030
Availability
Sold
Size
4 x 3.5 x 2 cm - Miniature 
Formula
Fe2+(Pb,Sn2+)6Sn4+2Sb3+2S14 (RRUFF)
Locality
Kalkar quarry, Santa Cruz Co., California, United States
Tagged
tin

A very nice specimen from an old stone quarry which is long gone by reclamation. The Franckeite on this piece is very reflective, silvery, foliated with striations and occurs on two spots as crystals to 5mm. On one side there are unknown silvery grains to 0.25mm. It is an old Minerals Unlimited 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
RC Stamberg Collection

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