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Cassiterite

#50106
SOLD
Cassiterite from Tin City, SE of Wales, Seward Peninsula, Alsaska - 50106
Cassiterite from Tin City, SE of Wales, Seward Peninsula, Alsaska - 50106

Cassiterite

#50106
Availability
Sold
Size
6 x 3.5 x 3 cm - Sm Cabinet 
Formula
SnO2 (RRUFF)
Locality
Tin City, SE of Wales, Seward Peninsula, Alsaska
Tagged
ore mineral , tin

Cassiterite contains about 79 percent tin. It is usually found in high temperature hydrothermal veins. It is a common alluvial and eluvial mineral in some areas of granitic rocks. Native tin is a silvery white metal, softer than zinc and harder than lead. It is malleable and ductile at 100 degress C. Tin can be rolled into foil as thin as 0.0002 of an inch. Used mostly in "tinplate" for "tin cans, in bronze (about 9% tin) as in bronze wires, bearings, gears, screws, washers etc. 

This is a chunk of Cassiterite with rounded edges, implying it is was found in an alluvial deposit. The locality is a little known locality found in 1902.

 

 

Cassiterite

Formula
SnO2 
Crystal System
Tetragonal 
Crystal Habit
Prismatic, Massive, Botryoidal 
Cleavage
Perfect, Indistinct, None 
Luster
Adamantine 
Color
brown, brownish black, colorless, green, gray 
Streak
brownish white 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Irregular 
Hardness
6-7 

Data courtesy of Webmineral.

Collection
Chris van Laer Collection

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