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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 aldermanite, amesite, bornite, cacoxenite, calcioferrite, and cheralite and more from places like Tom's Phosphate quarry, Kapunda, South Australia, Australia, Saranovskii mine, Urals Region, Russia, Dzhezkazgan mine, Karagandy, Kazakhstan, Gunheath China Clay Pit, St. Austell, Cornwall, England, Rocabruna mines, Bruguers, Barcelona, Catalonia, Spain, and Binghampton, New York, United States.

Aldermanite

on Fluellite - #25662
Locality
Tom's Phosphate quarry, Kapunda, South Australia, Australia 
Formula
Mg5Al12(PO4)8(OH)22·32H2
Availability
Sold
Size
5 x 3 x 2.5 cm - Miniature 
Tagged
phosphate  

White acicular crystals, less than 1mm, overgrown on Fluellite.


Aldermanite

Formula
Mg5Al12(PO4)8(OH)22·32H2
Crystal System
Orthorhombic 
Crystal Habit
Fibrous, Flakes 
Luster
Pearly 
Color
colorless 
Streak
white 
Class
Orthorhombic 
Hardness

Amesite

#48354
Locality
Saranovskii mine, Urals Region, Russia 
Formula
Mg2Al(SiAl)O5(OH)4 
Availability
Sold
Size
4.5 x 3 x 1 cm - Miniature 

Purple translucent crystals of Amesite to nearly 5mm. Amesite is a phyllosilicate and member of the serpentine group. It is formed in low grade metamorphic environments. These crystals are pseudohexagonal often tapering along the c-axis. They are stunning under the scope. The purple most likely is due to chromium impurity.


Amesite

Formula
Mg2Al(SiAl)O5(OH)4 
Crystal System
Triclinic 
Crystal Habit
Micaceous, Foliated, Pseudo Hexagonal 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
white, light green 
Streak
pale green 
Class
Triclinic - Pedial 
Hardness
2.5-3 
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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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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
SOLD
Cheralite - 50706
Cheralite - 50706

Cheralite

#50706
Locality
Binghampton, New York, United States 
Formula
CaTh(PO4)2 
Availability
Sold
Size
3 x 2.5 x 2 cm - Thumbnail 
Tagged
phosphate  
Special Info
Microprobed 

Black crystaline specimen verified by microprobe.  Ex. Parnau.


Cheralite

Collection
Dr. Buford Nichols Collection
Special Info
Microprobed
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Mindat
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