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Mixed Minerals

Friday, 22 December 2017 07:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including topaz and more from places like Três Barras, Padre Paraíso, Minas Gerais, Brazil.

Topaz

#RW48120
Locality
Três Barras, Padre Paraíso, Minas Gerais, Brazil 
Formula
Al2SiO4F2 
Availability
Sold
Size
3.2 x 2 x 2 cm - Miniature 

Nearly a waterclear crystal with just a trace of tan color. The crystal is terminated and by the photos you can see the unusual nature of the crystal with a right angle knotch along the c-axis. I have no idea what caused this. Minor chipping along the edges. This is just an old, uncommon locality piece with a Ward's label.


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
Collection
Robert J. Waidler Collection
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