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Mixed Minerals

Saturday, 05 May 2018 08:00 AM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including acanthite, arsenopyrite, brochantite, brucite, cacoxenite, and dolomite and more from places like Keeley-Frontier mine, Cobalt dist., Ontario, Canada, Panasqueira, Covilha, Castelo Branco dist., Portugal, Morenci mine, Greenlee Co., Arizona, United States, Killa Saifullah dist., Baluchistan, Pakistan, Leveäniemi Iron mine, Svappavaara, Lappland, Sweden.

Acanthite

#RW49050
Locality
Keeley-Frontier mine, Cobalt dist., Ontario, Canada 
Formula
Ag2
Availability
Available
Price
$125.00
Size
3.3 x 2.8 x 1.0 cm - Miniature 
Tagged
sulfide , silver  

Soft, sectile mass of Acanthite with many crude forms of cubic crystals. The cluster at the tip is 7mm across. The specimen comes from the historic cobalt/silver Keeley-Frontier mine located in one of the largest silver mining districts in the world. The mine produced an incredible 3.3 million pounds of cobalt and 19.1 million ounce of silver. There is associated Calcite in mass and as crystals, a clear indication that the specimen was never etched.


Acanthite

Formula
Ag2
Crystal System
Monoclinic 
Crystal Habit
Blocky, Skeletal, Arborescent 
Cleavage
poor to none 
Luster
Metallic 
Color
lead gray, gray, iron black 
Streak
shining black 
Class
Monoclinic - Prismatic 
Fracture
Sectile 
Hardness
2-2.5 
Collection
Robert J. Waidler Collection
Mineralpedia
View Acanthite
On Dakota Matrix
Previously Sold Acanthite
On Dakota Matrix
Other Available Acanthite
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Mindat
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Arsenopyrite

#49054
Locality
Panasqueira, Covilha, Castelo Branco dist., Portugal 
Formula
FeAsS 
Availability
Available
Price
$125.00
Size
5 x 4.5 x 4 cm - Miniature 
Tagged
sulfide  

An exceptional specimen of Arsenopyrite from arguably the world's best locality for this mineral. This specimen features large lustrous crystals to almost 3cm.


Arsenopyrite

Formula
FeAsS 
Crystal System
Monoclinic 
Crystal Habit
Striated, Euhedral Crystals, Prismatic 
Cleavage
one distinct 
Luster
Metallic 
Color
tin white, light steel gray 
Streak
black 
Geological Setting
Widespread. Most commonly found in medium to high temperature veins.  
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
5.5 to 6 

Brochantite

#RW48894
Locality
Morenci mine, Greenlee Co., Arizona, United States 
Formula
Cu4SO4(OH)6 
Availability
Sold
Size
6 x 3 x 2 cm - Sm Cabinet 
Tagged
copper  

Thick deep green prismatic crystals of Brochantite to 3mm.


Brochantite

Formula
Cu4SO4(OH)6 
Crystal System
Monoclinic 
Crystal Habit
Acicular, Prismatic, Druse 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
green, emerald green, black 
Streak
pale green 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
SOLD
Brucite - 48344
Brucite - 48344

Brucite

#48344
Locality
Killa Saifullah dist., Baluchistan, Pakistan 
Formula
Mg(OH)2 
Availability
Sold
Size
6.5 x 4.5 x 1.5 cm - Sm Cabinet 

Lemon yellow hemispherical groups of Brucite. 


Brucite

Formula
Mg(OH)2 
Crystal System
Trigonal 
Crystal Habit
Massive - Lamellar, Fibrous, Massive 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
blue, gray, gray blue, yellow, white 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Irregular 
Hardness
2.5-3 
On Dakota Matrix
Previously Sold Brucite
On Dakota Matrix
Other Available Brucite
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Mindat
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Cacoxenite

#BN49040
Locality
Leveäniemi Iron mine, Svappavaara, Lappland, Sweden 
Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Availability
Sold
Size
4.5 x 1.5 x 2 cm - Miniature 
Tagged
phosphate  

Golden fibrous hairs of Cacoxenite in iron ore matrix of Hematite. Uncommon, at least on the market for this locality.


Cacoxenite

Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Crystal System
Hexagonal 
Crystal Habit
Radial, Acicular, Stellate 
Cleavage
None, None, None 
Luster
Silky 
Color
brownish yellow, green, yellow, golden yellow, red yellow 
Streak
yellow 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
Collection
Dr. Buford Nichols Collection

Dolomite

#RW48893
Locality
Morenci mine, Greenlee Co., Arizona, United States 
Formula
CaMg(CO3)2 
Availability
Available
Price
$40.00
Size
7.5 x 2.5 x 3 cm - Sm Cabinet 
Tagged
carbonate  

White Dolomite rhombs with a slight pink color to 4mm.


Dolomite

Formula
CaMg(CO3)2 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Massive, Blocky - Rhombohedral 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
white, gray, reddish white, brownish white, gray 
Streak
white 
Class
Trigonal - Rhombohedral 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
Collection
Robert J. Waidler Collection
Mineralpedia
View Dolomite
On Dakota Matrix
Previously Sold Dolomite
On Dakota Matrix
Other Available Dolomite
WebMineral
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Mindat
View Dolomite

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