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Topaz (imperial)

#55831
SOLD
Topaz from Ouro Preto, Minas Gerais, Brazil - 55831
Topaz from Ouro Preto, Minas Gerais, Brazil - 55831

Topaz (imperial)

#55831
Availability
Sold
Size
2.5 x 2.5 x 2 cm - Thumbnail 
Formula
Al2SiO4F2 (RRUFF)
Locality
Ouro Preto, Minas Gerais, Brazil

Three gemmy partial crystals with a few good striated faces. The largest is 2.5cm then 1.6cm and 2.1

Topaz

Formula
Al2SiO4F2 
Crystal System
Orthorhombic 
Crystal Habit
Crystalline - Coarse, Prismatic, Massive - Granular 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, pale blue, yellow, yellowish brown, red 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Uneven 
Hardness
8 

Data courtesy of Webmineral.

Collection
Dr. Buford Nichols Collection
Mineralpedia
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