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Recently Released New Additions

Mixed Rare Minerals

Friday, 24 May 2024 12:00 PM

Introducing the "Mixed Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including chkalovite, cosalite, and franckeite and more from places like Shkatulka peg., Umbozero mine, Alluaiv Mt., Lovozero, Kola Peninsula, Russia, Bolivar mine, Piedras Verdes, Chihuahua, Mexico, and San José mine, Oruro City, Oruro Dept., Bolivia.

Chkalovite - 63671
Chkalovite - 63671

Chkalovite

#63671
Locality
Shkatulka peg., Umbozero mine, Alluaiv Mt., Lovozero, Kola Peninsula, Russia 
Formula
Na2BeSi2O6 
Availability
Available
Price
$60.00
Size
2 x 2 x 1.2 cm - Thumbnail 
Tagged
beryllium  
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 

White, translucent crystalline specimen. Chkalovite is a rare beryllium silicate described in 1939, found Quebec, Greenland and Russia. This specimen is composed of nearly all white to clear Chkalovite. It was identified by Dr. Igor Pekov.


Chkalovite

Formula
Na2BeSi2O6 
Crystal System
Orthorhombic 
Crystal Habit
Equant Grains 
Cleavage
Fair, Indistinct, None 
Luster
Vitreous - Greasy 
Color
colorless, white 
Streak
white 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
6 
Special Info
XRD Confirmed
Special Info
EDS Confirmed
On Dakota Matrix
Previously Sold Chkalovite
On Dakota Matrix
Other Available Chkalovite
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Cosalite - 64160
Cosalite - 64160

Cosalite

with Chalcopyrite - #64160
Locality
Bolivar mine, Piedras Verdes, Chihuahua, Mexico 
Formula
Pb2Bi2S5 
Availability
Available
Price
$95.00
Size
6 x 3 x 2.6 cm - Sm Cabinet 

Gray metallic, long slender, crystals to 3mm. There are several areas which contain the Cosalite in Quartz and Chalcopyrite marix.


Cosalite

Formula
Pb2Bi2S5 
Crystal System
Orthorhombic 
Crystal Habit
Radial, Massive - Fibrous 
Cleavage
Good, None, None 
Luster
Metallic 
Color
gray, steel gray, silver white 
Streak
black 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
2.5-3 
Mineralpedia
View Cosalite
On Dakota Matrix
Previously Sold Cosalite
On Dakota Matrix
Other Available Cosalite
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Franckeite - BAC64159
Franckeite - BAC64159

Franckeite

#BAC64159
Locality
San José mine, Oruro City, Oruro Dept., Bolivia 
Formula
Fe2+(Pb,Sn2+)6Sn4+2Sb3+2S14 
Availability
Available
Price
$75.00
Size
2.5 x 2.5 x 1.5 cm - Thumbnail 
Tagged
sulfide , tin  

Very, very good large crystals of Franckeite with a platy habit and striations. The largest crystal is 6mm. There are also prismatic Arsenopyrite and an acicular mineral.


Franckeite

Formula
Fe2+(Pb,Sn2+)6Sn4+2Sb3+2S14 
Crystal System
Triclinic 
Crystal Habit
Tabular, Massive - Fibrous, Radial 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
grayish black, blackish gray 
Streak
grayish black 
Class
Triclinic - Pinacoidal 
Fracture
Flexible 
Hardness
2.5 
Collection
William & Anne Cook Collection
Mineralpedia
View Franckeite
On Dakota Matrix
Previously Sold Franckeite
On Dakota Matrix
Other Available Franckeite
WebMineral
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Mindat
View Franckeite

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