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Rare & Mixed Minerals

Thursday, 16 June 2022 06:00 PM

Introducing the "Rare & Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including gratonite, grossular, hedleyite, iowaite, kaolinite, and kernite and more from places like Excelsior mine, Cerro de Pasco, Pasco dept., Peru, Orford Nickel mine, Estrie, Quebec, Canada, Good Hope mine, Hedley, British Columbia, Canada, Kaznakhtinskiy ultrabasic massif, Terekta Ridge, Altai Mts., Russia, The Geysers, Sonoma Co., California, United States, and Boron, Kern Co., California, United States.

Gratonite

#RS58587
Locality
Excelsior mine, Cerro de Pasco, Pasco dept., Peru 
Formula
Pb9As4S15 
Availability
Available
Price
$265.00
Size
2.8 x 2 x 1.4 cm - Thumbnail 

Superb specimen of Gratonite from the type locality. Terminations are seen as trigonal pyramids formed by three faces intersecting at the tip. Many of the crystals are naturally pitted and several are brilliant with a silvery luster. There are several clusters of crystals in radial groups.


Gratonite

Formula
Pb9As4S15 
Crystal System
Trigonal 
Cleavage
None, None, None 
Luster
Metallic 
Color
lead gray, dark lead gray 
Streak
black 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Brittle 
Hardness
2.5 
Collection
RC Stamberg Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Gratonite
On Dakota Matrix
Other Available Gratonite
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Grossular

(chromian) - #RS58614
Locality
Orford Nickel mine, Estrie, Quebec, Canada 
Formula
Ca3Al2(SiO4)3 
Availability
Sold
Size
3.3 x 2.6 x 2 cm - Miniature 

Good micro crystals, less than 1mm, of bright green Grossular garnet with vitreous masses of Chromite. It is a much better and brighter green in-hand.


Grossular

Collection
RC Stamberg Collection

Hedleyite

#RS58631
Locality
Good Hope mine, Hedley, British Columbia, Canada 
Formula
Bi7Te3 
Availability
Sold
Size
4.5 x 4 x 3.5 cm - Miniature 
Tagged
tellurium  
Special Info
Type Locality 

Several silvery crystals to 1mm.


Hedleyite

Formula
Bi7Te3 
Crystal System
Trigonal 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
iron black, black, tin white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Flexible 
Hardness
Collection
RC Stamberg Collection
Special Info
Type Locality
Mineralpedia
View Hedleyite
On Dakota Matrix
Previously Sold Hedleyite
On Dakota Matrix
Other Available Hedleyite
WebMineral
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Mindat
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SOLD
Iowaite - 57783
Iowaite - 57783

Iowaite

#57783
Locality
Kaznakhtinskiy ultrabasic massif, Terekta Ridge, Altai Mts., Russia 
Formula
Mg6Fe3+2(OH)16Cl2·4H2
Availability
Sold
Size
5 x 3 x 1.5 cm - Miniature 
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 

Slippery like soap purple foliated mass of deep purple Iowaite formed by the alteration of serpentine and a member of the Hydrotalcite group.


Iowaite

Formula
Mg6Fe3+2(OH)16Cl2·4H2
Crystal System
Trigonal 
Crystal Habit
Platy 
Cleavage
Perfect, None, None 
Luster
Greasy (Oily) 
Color
bluish green, greenish white, honey yellow 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Hardness
1.5 
Special Info
XRD Confirmed
Special Info
EDS Confirmed
Mineralpedia
View Iowaite
On Dakota Matrix
Previously Sold Iowaite
On Dakota Matrix
Other Available Iowaite
WebMineral
View Iowaite
Mindat
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SOLD
Kaolinite - RS58616
Kaolinite - RS58616

Kaolinite

var. miloschite - #RS58616
Locality
The Geysers, Sonoma Co., California, United States 
Formula
Al2Si2O5(OH)4 
Availability
Sold
Size
4.5 x 1 x 1 cm - Miniature 

Powdered blue Kaolinite in vial.


Kaolinite

Formula
Al2Si2O5(OH)4 
Crystal System
Triclinic 
Crystal Habit
Earthy 
Cleavage
Perfect, None, None 
Luster
Earthy (Dull) 
Color
white, brownish white, grayish white, yellowish white, grayish green 
Streak
white 
Class
Triclinic - Pedial 
Fracture
Earthy 
Hardness
1.5-2 
Collection
RC Stamberg Collection

Kernite

#RS58621
Locality
Boron, Kern Co., California, United States 
Formula
Na2B4O6(OH)2·3H2
Availability
Sold
Size
6.5 x 1.5 x 1.5 cm - Sm Cabinet 

Sharp prismatic colorless to cloudy Kernite.


Kernite

Formula
Na2B4O6(OH)2·3H2
Crystal System
Monoclinic 
Crystal Habit
Crystalline - Coarse, Acicular, Massive 
Cleavage
Perfect, Perfect, Good 
Luster
Vitreous - Pearly 
Color
colorless, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
2.5-3 
Collection
RC Stamberg Collection
Mineralpedia
View Kernite
On Dakota Matrix
Previously Sold Kernite
On Dakota Matrix
Other Available Kernite
WebMineral
View Kernite
Mindat
View Kernite

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