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Franckeite

#56174

Franckeite

#56174
Availability
Available
Price
$50.00
Size
4.5 x 4.5 x 4 cm - Miniature 
Formula
Fe2+(Pb,Sn2+)6Sn4+2Sb3+2S14 (RRUFF)
Locality
San José mine, Oruro City, Oruro Dept., Bolivia
Tagged
sulfide , tin

Excellent example of sulfide vein mineralization. In this case the sulfide is tin sulfide sandwiched between Pyrite and Quartz. The Franckeite crystals are  platy and are generally between 1 to 3mm in size and some having striations. EDS.

EDS Confirmed

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.

Special Info
EDS Confirmed

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