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Mixed Minerals

Sunday, 19 May 2019 12:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including nifontovite, tetrahedrite, and zinkenite and more from places like Mina Rey y Reina, Charcas, San Luis Potosi, Mexico, Julcani mine, Julcani dist., Huancavelica dept., Peru, and San Germán mine, Cerro de Potosí, Potosí, Bolivia.

Nifontovite

#50713
Locality
Mina Rey y Reina, Charcas, San Luis Potosi, Mexico 
Formula
Ca3[BO(OH)2]6·2H2
Availability
Available
Price
$225.00
Size
4.5 x 3 x 3 cm - Miniature 

Superb long colorless crystals to 2cm. Pretty much all of the larger crystals are complete and terminated. Exceptional piece.


Nifontovite

Formula
Ca3[BO(OH)2]6·2H2
Crystal System
Monoclinic 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray 
Streak
white 
Class
Monoclinic 
Hardness
3.5 

Tetrahedrite

with Pyrite - #50748
Locality
Julcani mine, Julcani dist., Huancavelica dept., Peru 
Formula
Cu12Sb4S13 
Availability
Available
Price
$125.00
Size
8 x 8 x 2.5 cm - Sm Cabinet 
Tagged
sulfide , copper  

Full tetrahedrons of Tetrahedrite crystals to 6mm. Most of the crystals are "merged" or stack upon each other. The backside is full of Pyrite crystals,


Tetrahedrite

Formula
Cu12Sb4S13 
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Massive 
Cleavage
None, None, None 
Luster
Metallic 
Color
iron gray, black, steel gray 
Streak
black 
Class
Isometric - Hextetrahedral 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Robert J. Waidler Collection

Zinkenite

with Andorite & Arsenopyrite - #50350
Locality
San Germán mine, Cerro de Potosí, Potosí, Bolivia 
Formula
Pb9Sb22S42 
Availability
Available
Price
$275.00
Size
7.5 x 8 x 6 cm - Sm Cabinet 
Tagged
sulfide  

Full divergent silvery prismatic crystals to 6mm in a large vug with more single crystals of Zinkenite. The finer, smaller grey crystals are probably Jamesonite, although that is not mentioned on the tag provided with the specimen.


Zinkenite

Formula
Pb9Sb22S42 
Crystal System
Hexagonal 
Crystal Habit
Acicular, Prismatic, Striated 
Cleavage
Imperfect, None, None 
Luster
Metallic 
Color
gray, steel gray 
Streak
steel gray 
Class
Hexagonal - Pyramidal 
Fracture
Uneven 
Hardness
3-3.5 
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