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0 item @ $0.00  

Mixed Minerals

Friday, 03 May 2019 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including bornite, cacoxenite, calcioferrite, calcite, chalcopyrite, and goethite and more from places like Dzhezkazgan mine, Karagandy, Kazakhstan, Gunheath China Clay Pit, St. Austell, Cornwall, England, Rocabruna mines, Bruguers, Barcelona, Catalonia, Spain, Shigar Valley , Baltistan, Northern Areas, Pakistan, Idarado mine, Telluride, San Miguel Co., Colorado, United States, and Whiteside mine, Mesabi Range, St. Louis Co., Minnesota, United States.

Bornite

#50676
Locality
Dzhezkazgan mine, Karagandy, Kazakhstan 
Formula
Cu5FeS4 
Availability
Sold
Size
9.5 x 4.5 x 3 cm - Cabinet 
Tagged
sulfide , copper  

Dull black crystals of Bornite without much crystal form but nonethelss nice single crystals,


Bornite

Formula
Cu5FeS4 
Crystal System
Orthorhombic 
Crystal Habit
Massive - Granular, Reniform, Granular 
Cleavage
Imperfect, None, None 
Luster
Metallic 
Color
copper red, bronze brown, purple 
Streak
grayish black 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
Mineralpedia
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Previously Sold Bornite
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Cacoxenite

with Arthurite - #50267
Locality
Gunheath China Clay Pit, St. Austell, Cornwall, England 
Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Availability
Available
Price
$25.00
Size
4.5 x 3.5 x 2 cm - Miniature 
Tagged
phosphate  

Yellow crusts of Cacoxenite with green Arthurite. A good locality specimen.


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 
SOLD
Calcioferrite - 50667
Calcioferrite - 50667

Calcioferrite

#50667
Locality
Rocabruna mines, Bruguers, Barcelona, Catalonia, Spain 
Formula
Ca4MgFe3+4(PO4)6(OH)4·12H2
Availability
Sold
Size
5.5 x 3.5 x 2 cm - Sm Cabinet 
Tagged
phosphate  

Green crusts of Calcioferrite.


Calcioferrite

Formula
Ca4MgFe3+4(PO4)6(OH)4·12H2
Crystal System
Monoclinic 
Crystal Habit
Foliated, Reniform 
Cleavage
Perfect, Very Good, None 
Luster
Pearly 
Color
greenish yellow, yellow, yellow green, yellowish white 
Streak
yellowish white 
Class
Monoclinic - Sphenoidal 
Fracture
Brittle 
Hardness
2.5 
Collection
Dr. Buford Nichols Collection

Calcite

on Microcline - #48513
Locality
Shigar Valley , Baltistan, Northern Areas, Pakistan 
Formula
CaCO3 
Availability
Sold
Size
11 x 6 x 7 cm - Cabinet 
Tagged
carbonate  

Calcite, especially this size, is rare in pegmatites. Most carbonates are associated with the primary phosphates. This specimen is an unusually large Calcite crystal perched nicely on Microcline. The specimen was photographed for figue 4-24 in London's "Pegmatites" book. See prov. tab for London't label.


Calcite

Formula
CaCO3 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Stalactitic, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
colorless, white, pink, yellow, brown 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
Mineralpedia
View Calcite
On Dakota Matrix
Previously Sold Calcite
On Dakota Matrix
Other Available Calcite
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Mindat
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SOLD
Chalcopyrite - 50670
Chalcopyrite - 50670

Chalcopyrite

with Pyrite - #50670
Locality
Idarado mine, Telluride, San Miguel Co., Colorado, United States 
Formula
Cu1+Fe3+S2 
Availability
Sold
Size
9 x 10 x 3 cm - Cabinet 
Tagged
sulfide , copper  

Large chunk of massive Chalcopyrite with Pyrite.


Chalcopyrite

Formula
Cu1+Fe3+S2 
Crystal System
Tetragonal 
Crystal Habit
Euhedral Crystals, Striated, Druse 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
brass yellow, honey yellow 
Streak
greenish black 
Class
Tetragonal - Scalenohedral 
Fracture
Brittle 
Hardness
3.5 
Collection
Robert J. Waidler Collection

Goethite

#50677
Locality
Whiteside mine, Mesabi Range, St. Louis Co., Minnesota, United States 
Formula
FeO(OH) 
Availability
Available
Price
$35.00
Size
5.5 x 3 x 3 cm - Sm Cabinet 

Botryoidal Goethite with nice cross-sections showing crystal habits. Collected in 1960 as the label shows (see prov.)


Goethite

Formula
FeO(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Acicular, Reniform, Radial 
Cleavage
Perfect, Distinct, None 
Luster
Adamantine - Silky 
Color
brown, reddish brown, yellowish brown, brownish yellow, ocher yellow 
Streak
yellowish brown 
Class
Orthorhombic - Dipyramidal 
Fracture
Hackly 
Hardness
5-5.5 
Mineralpedia
View Goethite
On Dakota Matrix
Previously Sold Goethite
On Dakota Matrix
Other Available Goethite
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Mindat
View Goethite

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