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Mixed Minerals

Friday, 04 August 2017 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including acanthite, braggite, rhodonite, scheelite, and sperrylite and more from places like O'Brien mine, Cobalt, Ontario, Canada, Schneeberg dist., Erzgebirge, Saxony, Germany, Merensky Reef, Bushveld Complex, Limpopo prov., South Africa, Broken Hill, New South Wales, Australia, Mt Xuebaoding, Pingwu Co., Mianyang, Sichuan prov., China, and Broken Hammer dep., Sudbury, Ontario, Canada.

Acanthite

on Silver - #RW47270
Locality
O'Brien mine, Cobalt, Ontario, Canada 
Formula
Ag2
Availability
Available
Price
$750.00
Size
11 x 5 x 0.4 cm - Cabinet 
Tagged
sulfide , silver  
Special Info
Antique Specimen 

The specimen is mostly a solid leaf of Silver with a coating of Acanthite. This has good provenance with an old inked label stuck on the specimen and dated 1980. With it is a nice large label from the "Department of Mines Geological Survey" of Canada with a number matching the specimen (7720). Documentation of a specimen's history does not get better than this.


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
Special Info
Antique Specimen
Mineralpedia
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Previously Sold Acanthite
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Other Available Acanthite
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Acanthite

with Calcite - #RW47272
Locality
Schneeberg dist., Erzgebirge, Saxony, Germany 
Formula
Ag2
Availability
Available
Price
$795.00
Size
7 x 7 x 5 cm - Sm Cabinet 
Tagged
sulfide , silver  

Cabinet size specimen with a large cavity filled with 1-4mm steely grey Acanthite crystals in abundance with good Calcite crystals.  Excellent specimen from this classic German locality.


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
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Previously Sold Acanthite
On Dakota Matrix
Other Available Acanthite
WebMineral
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Mindat
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Braggite

#RW47281
Locality
Merensky Reef, Bushveld Complex, Limpopo prov., South Africa 
Formula
PtS 
Availability
Sold
Size
9.5 x 5.5 x 1.5 cm - Cabinet 
Tagged
platinum  

A polished slab showing the excellent large crystal grains of ultramafic rock, which was usually magmatically differentiated by fractionation as it cooled i.e., the denser minerals settled first and cumulate at the base of the magma chamber. Numerous metallic crystals can be seen throughout the slab and measure from 1-5mm. These are the Braggite crystals. There is no doubt other platinum minerals in the specimen.


Braggite

Formula
PtS 
Crystal System
Tetragonal 
Cleavage
None, None, None 
Luster
Metallic 
Color
steel gray 
Class
Tetragonal - Dipyramidal 
Hardness
1.5 
Collection
Robert J. Waidler Collection
Mineralpedia
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Rhodonite

with Galena - #BN47256
Locality
Broken Hill, New South Wales, Australia 
Formula
Mn2+SiO3 
Availability
Available
Price
$95.00
Size
6.5 x 4 x 5 cm - Sm Cabinet 

Large deep red rounded Rhodonite crystals with terminations to 1.8cm in Galena and Sphalerite matrix.


Rhodonite

Formula
Mn2+SiO3 
Crystal System
Triclinic 
Crystal Habit
Tabular, Massive, Massive - Granular 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous (Glassy) 
Color
pink, rose red, brownish red, black, yellow 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
Collection
Dr. Buford L. Nichols Collection
Mineralpedia
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Scheelite

#RW47253
Locality
Mt Xuebaoding, Pingwu Co., Mianyang, Sichuan prov., China 
Formula
CaWO4 
Availability
Available
Price
$250.00
Size
5.5 x 4 x 3.5 cm - Sm Cabinet 
Special Info
Fluorescent 

Deep orange partial octahedron of Scheelite. A splendid piece with good luster.


Scheelite

Formula
CaWO4 
Crystal System
Tetragonal 
Crystal Habit
Massive - Granular, Disseminated, Columnar 
Cleavage
Distinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, white, pale yellow, brownish yellow, reddish yellow 
Streak
white 
Class
Tetragonal - Dipyramidal 
Fracture
Uneven 
Hardness
4-5 
Collection
Robert J. Waidler Collection
Special Info
Fluorescent
Mineralpedia
View Scheelite
On Dakota Matrix
Previously Sold Scheelite
On Dakota Matrix
Other Available Scheelite
WebMineral
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Mindat
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Sperrylite

on Chalcopyrite - #47264
Locality
Broken Hammer dep., Sudbury, Ontario, Canada 
Formula
PtAs2 
Availability
Available
Price
$395.00
Size
5.5 x 3 x 3 cm - Sm Cabinet 

Well-formed, complex 3mm shiny silvery crystal of Sperrylite. There are a few others, but are fractured grains. Excellent specimen and very hard to obtain locality.


Sperrylite

Formula
PtAs2 
Crystal System
Isometric 
Crystal Habit
Disseminated, Crystalline - Fine 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
tin white 
Streak
black 
Class
Isometric - Diploidal 
Fracture
Conchoidal 
Hardness
6-7 
Collection
Robert J. Waidler Collection

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