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Mixed Minerals

Saturday, 13 January 2018 12:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including andradite, anglesite, beraunite, calcite, chlorargyrite, and chloroxiphite and more from places like Harstigen mine, Filipstad, Värmland, Sweden, Tsumeb mine, Tsumeb, Namibia, Three Oaks Gap, Polk Co., Arkansas, United States, Butte dist., Silver Bow Co., Montana, United States, Broken Hill, New South Wales, Australia, and Higher Pitts Mine, Priddy, Somerset, England.

Andradite

with unknown - #PD48052
Locality
Harstigen mine, Filipstad, Värmland, Sweden 
Formula
Ca3Fe3+2(SiO4)3 
Availability
Available
Price
$65.00
Size
10 x 6 x 6.5 cm - Cabinet 
Special Info
EDS Confirmed 

This is a large specimen with one face partially covered by crude to formless dark orange Andradite (EDS). Amongst the Andradite are tiny red spheres of an unknown mineral. These crystals are likely covered by Quartz, imparting a crystal ball-like appearance. I have not bothered to test these, and have chosen to leave these to your imagination.


Andradite

Formula
Ca3Fe3+2(SiO4)3 
Crystal System
Isometric 
Crystal Habit
Crystalline - Coarse, Euhedral Crystals, Massive 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
black, yellowish brown, red, greenish yellow, gray 
Streak
white 
Class
Isometric - Hexoctahedral 
Fracture
Conchoidal 
Hardness
6.5-7 
Collection
Don Phillips Collection
Special Info
EDS Confirmed
Mineralpedia
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On Dakota Matrix
Previously Sold Andradite
On Dakota Matrix
Other Available Andradite
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Anglesite

with unknowns - #PD48224
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
PbSO4 
Availability
Available
Price
$175.00
Size
6.5 x 5 x 5 cm - Sm Cabinet 

Colorless Anglesite crystals from 1 to 1.5cm in and on a sulfide rich matrix full of interesting unknowns, but probably Pyrite at the yellow arrow and Malachite and the blue arrow. At the red arrow are murky colorless crystals with blue inclusions.  Possibly some Covellite on the specimen. See prov. tab - Ulrike Kahn label


Anglesite

Formula
PbSO4 
Crystal System
Orthorhombic 
Crystal Habit
Granular, Stalactitic 
Cleavage
Good, Distinct, None 
Luster
Adamantine 
Color
blue, colorless, green, gray, yellow 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5-3 
Collection
Don Phillips Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Anglesite
On Dakota Matrix
Other Available Anglesite
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Mindat
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Beraunite

with Kidwellite - #BN48222
Locality
Three Oaks Gap, Polk Co., Arkansas, United States 
Formula
Fe2+Fe3+5(PO4)4(OH)5·6H2
Availability
Sold
Size
5 x 4 x 3 cm - Miniature 
Tagged
phosphate  

Deep red long, bladed crystals of Beraunite to 9mm. Near the base of the specimen Kidwellite has pseudomorphed the Beraunite. Near the center, tiny green beads of Kidwellite are found. An outstanding specimen for Beraunite.


Beraunite

Formula
Fe2+Fe3+5(PO4)4(OH)5·6H2
Crystal System
Monoclinic 
Crystal Habit
Druse, Radial, Globular 
Cleavage
Good, None, None 
Luster
Vitreous - Dull 
Color
green, greenish brown, gray green, dark greenish brown, dark red 
Streak
green brown 
Class
Monoclinic - Prismatic 
Hardness
Collection
Dr. Buford Nichols Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Beraunite
On Dakota Matrix
Other Available Beraunite
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Mindat
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Calcite

with Pyrite - #45873
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
CaCO3 
Availability
Sold
Size
8 x 5.5 x 4 cm - Sm Cabinet 
Tagged
carbonate  

Slender scalenohedral, dipyramidal crystals to 3.3cm on micro octahedral Pyrite.


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
Collection
Chris van Laer Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Calcite
On Dakota Matrix
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Mindat
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Chlorargyrite

with Azurite - #PD48051
Locality
Broken Hill, New South Wales, Australia 
Formula
AgCl 
Availability
Available
Price
$195.00
Size
4.5 x 3 x 3 cm - Miniature 
Tagged
silver  

An outstanding specimen of yellow Chlorargyrite with several crystals having achieved almost perfect forms. The crystals are about 1 to 1.5mm, but there are formess blebs to 4mm. It is associated with dark blue Azurite. The original Allens Minerals label states that it is Tocornalite, but there is no mercury detected by EDS.  


Chlorargyrite

Formula
AgCl 
Crystal System
Isometric 
Crystal Habit
Massive, Columnar 
Cleavage
None, None, None 
Luster
Adamantine - Resinous 
Color
purplish gray, green, white, colorless 
Streak
white 
Class
Isometric - Hexoctahedral 
Fracture
Sectile 
Hardness
1-1.5 
Collection
Don Phillips Collection

Chloroxiphite

in Mendipite - #PD33012
Locality
Higher Pitts Mine, Priddy, Somerset, England 
Formula
Pb3CuO2Cl2(OH)2 
Availability
Available
Price
$65.00
Size
3.5 x 2.5 x 2.5 cm - Miniature 
Tagged
copper  
Special Info
Type Locality 

Dull, dark green 2mm crystal of Chloroxiphite in light pinkish, striated Mendipite.


Chloroxiphite

Formula
Pb3CuO2Cl2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Tabular 
Cleavage
Perfect, Distinct, None 
Luster
Adamantine - Resinous 
Color
dull olive green, pistachio green 
Streak
light yellow green 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
2.5 
Collection
Don Phillips Collection
Special Info
Type Locality

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