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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, malachite, metacinnabar, mimetite, and stichtite and more from places like Excelsior mine, Cerro de Pasco, Pasco dept., Peru, Tsumeb mine, Tsumeb, Namibia, Mount Diablo mine, Contra Costa Co., California, United States, San Pedro Corralitos, Chihuahua, Mexico, and Dundas, Zeehan, Tasmania, Australia.

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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Previously Sold Gratonite
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Mindat
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Malachite

#RS58620
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Cu2CO3(OH)2 
Availability
Available
Price
$85.00
Size
4.5 x 2.5 x 1.5 cm - Miniature 
Tagged
carbonate , copper  
Special Info
Antique Specimen 

Green Malachite from the collection of Herbert Maucher, the son of Wilhelm Maucher (1879 - 1930), the famed German mineral dealer. W. Maucher attended the Freiburg Mining Academy and the mineral Maucherite was named in his honor. More on Maucher can be read on the Mineralogical Label Archive


Malachite

Formula
Cu2CO3(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Botryoidal, Stalactitic, Massive - Fibrous 
Cleavage
Perfect, Fair, None 
Luster
Vitreous - Silky 
Color
green, dark green, blackish green 
Streak
light green 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 
Collection
RC Stamberg Collection
Special Info
Antique Specimen
Mineralpedia
View Malachite
On Dakota Matrix
Previously Sold Malachite
On Dakota Matrix
Other Available Malachite
WebMineral
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Mindat
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Metacinnabar

#RS58633
Locality
Mount Diablo mine, Contra Costa Co., California, United States 
Formula
HgS 
Availability
Available
Price
$40.00
Size
3.2 x 2.3 x 1.5 cm - Miniature 
Tagged
sulfide  

Black to silvery crystalline mass.


Metacinnabar

Formula
HgS 
Crystal System
Isometric 
Crystal Habit
Granular, Encrustations 
Cleavage
None, None, None 
Luster
Metallic 
Color
black, gray black 
Streak
black 
Class
Isometric - Hextetrahedral 
Fracture
Uneven 
Hardness
Collection
RC Stamberg Collection

Mimetite

#RS58589
Locality
San Pedro Corralitos, Chihuahua, Mexico 
Formula
Pb5(AsO4)3Cl 
Availability
Available
Price
$275.00
Size
6.2 x 4.3 x 2.3 cm - Sm Cabinet 
Tagged
arsenate  

Beautiful, choice, orange botryoidal crystal groups to 7mm.


Mimetite

Formula
Pb5(AsO4)3Cl 
Crystal System
Hexagonal 
Crystal Habit
Reniform, Globular, Prismatic 
Cleavage
Imperfect, None, None 
Luster
Adamantine - Resinous 
Color
white, yellow, orange, brown, red 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
Collection
RC Stamberg Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Mimetite
On Dakota Matrix
Other Available Mimetite
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Mindat
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Stichtite

#RS58588
Locality
Dundas, Zeehan, Tasmania, Australia 
Formula
Mg6Cr2CO3(OH)16·4H2
Availability
Available
Price
$50.00
Size
4 x 3 x 1.5 cm - Miniature 
Tagged
carbonate  

Rich purple soft mass of Stitchite formed by the alteration of serpentine rich in Chromite. It is often associated with Antigorite.


Stichtite

Formula
Mg6Cr2CO3(OH)16·4H2
Crystal System
Trigonal 
Crystal Habit
Encrustations, Nodular, Micaceous 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
lilac, light violet, pink 
Streak
pale violet blue 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Uneven 
Hardness
1.5-2 
Collection
RC Stamberg Collection
Mineralpedia
View Stichtite
On Dakota Matrix
Previously Sold Stichtite
On Dakota Matrix
Other Available Stichtite
WebMineral
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Mindat
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