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Mixed Minerals

Friday, 13 March 2020 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including tiragalloite, and topaz and more from places like Cassagna Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy, and Tepetates, San Luis Potosi, Mexico.

Tiragalloite

#52766
Locality
Cassagna Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy 
Formula
Mn2+4As5+Si3O12(OH) 
Availability
Available
Price
$65.00
Size
4 x 2.5 x 2.5 cm - Miniature 

Bright orange compact fibrous crystals in thin 3mm seam.


Tiragalloite

Formula
Mn2+4As5+Si3O12(OH) 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Acicular 
Cleavage
Good, Parting, None 
Luster
Subadamantine 
Color
orange 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness

Topaz

with hyalite - #52332
Locality
Tepetates, San Luis Potosi, Mexico 
Formula
Al2SiO4F2 
Availability
Available
Price
$20.00
Size
1.5 x 1 x 1 cm - Thumbnail 

A reddish brown 1.4cm Topaz crystal with a little hyalite attached.


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
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