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Cassiterite

#AH57020

Cassiterite

#AH57020
Availability
Sold
Size
2.5 x 1.2 x 0.8 cm - Thumbnail 
Formula
SnO2 (RRUFF)
Locality
Viloco, Araca dist., La Paz dept., Bolivia
Tagged
tin

It is amazing how lustrous a Cassiterite can be. Some of the bes,t if not the best, are the Cassiterites from Bolivia. Of course I've seen some terrible specimens with no luster from Bolivia. But this little thumbnail is amazing. There are multiple faces for each crystal and some cyclic twinning can be see. It is very reflective and, it is nearly opache too, barely any light gets through even on my scope lights. There are many 4-5mm crystals but they all merge together. Very good little guy.

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
Arnold G Hampson Collection

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