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Rare Minerals

Wednesday, 01 January 2025 06:00 PM

Introducing the "Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including bismutite, franckeite, hejtmanite, and tlapallite and more from places like Schmiedestollen, Wittichen, Baden-Württemberg, Germany, Pirquitas Ag-Sn Deposit, Rinconada Dept., Jujuy, Argentina, Dara-i-Pioz Massif, Tajikistan, and Moctezuma mine, Moctezuma, Sonora, Mexico.

Bismutite

#JD65243
Locality
Schmiedestollen, Wittichen, Baden-Württemberg, Germany 
Formula
Bi2O2(CO3
Availability
Available
Price
$30.00
Size
2 x 2 x 1.5 cm - Thumbnail 
Tagged
carbonate  

Yellow bead-like crystals grown on spindly Quartz.


Bismutite

Formula
Bi2O2(CO3
Crystal System
Orthorhombic 
Crystal Habit
Fibrous, Earthy 
Cleavage
Distinct, None, None 
Luster
Vitreous - Pearly 
Color
brown, brownish yellow, green, gray, yellow 
Streak
gray 
Class
Orthorhombic - Pyramidal 
Hardness
Collection
John Dagenais Collection

Franckeite

(arsenian) - #BAC65187
Locality
Pirquitas Ag-Sn Deposit, Rinconada Dept., Jujuy, Argentina 
Formula
Fe2+(Pb,Sn2+)6Sn4+2Sb3+2S14 
Availability
Available
Price
$35.00
Size
2.2 x 1 x 0.8 cm - Thumbnail 
Tagged
sulfide , tin  

Very fine granular Franckeite. 


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

Hejtmanite

#BAC65247
Locality
Dara-i-Pioz Massif, Tajikistan 
Formula
BaMn2+2Ti(Si2O7)O(OH)2 
Availability
Sold
Size
4.5 x 2 x 2.5 cm - Miniature 

Hejtmanite occurs on this specimen as flashy bright orange brown plates on matrix. 


Hejtmanite

Formula
BaMn2+2Ti(Si2O7)O(OH)2 
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
golden yellow, orange brown 
Streak
brown yellow 
Class
Monoclinic - Prismatic 
Hardness
4.5 
Collection
William & Anne Cook Collection

Tlapallite

#JD65239
Locality
Moctezuma mine, Moctezuma, Sonora, Mexico 
Formula
H6Ca2Cu3SO4(Te4+O3)4(Te6+O6
Availability
Sold
Size
5.5 x 55 x 2.5 cm - Cabinet 
Tagged
copper , tellurium  

This is a very rich specimen loaded with mint green crusts of Tlapallite,


Tlapallite

Formula
H6Ca2Cu3SO4(Te4+O3)4(Te6+O6
Crystal System
Monoclinic 
Crystal Habit
Thin, Encrustations 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
green, cyprus green 
Class
Monoclinic 
Hardness
Collection
John Dagenais Collection

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