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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, rhodonite, sperrylite, strengite, and wavellite and more from places like O'Brien mine, Cobalt, Ontario, Canada, Broken Hill, New South Wales, Australia, Broken Hammer dep., Sudbury, Ontario, Canada, Leveäniemi Iron mine, Svappavaara, Lappland, Sweden, and Mt. Ida, Montgomery Co., Arkansas, Unted States.

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
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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
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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

Strengite

#BN47257
Locality
Leveäniemi Iron mine, Svappavaara, Lappland, Sweden 
Formula
Fe3+PO4·2H2
Availability
Available
Price
$375.00
Size
5 x 5.5 x 2 cm - Sm Cabinet 
Tagged
phosphate  

Stunning purple crystal groups of Strengite. The groups are very large and the crystals sharp and distinct to 8mm. I have not seen Strengite groups of this size from any deposit. They are probably out there but, I have not seen them. Strengite occurs all over the world, but it is still uncommon and usually found in sedimentary phosphate deposits and pegmatites. But they also occur in iron ore such as Svappavaara.  This is wonderful specimen and deserving of a good, discriminating collector. 


Strengite

Formula
Fe3+PO4·2H2
Crystal System
Orthorhombic 
Crystal Habit
Spherical, Radial, Botryoidal 
Cleavage
Good, Poor, None 
Luster
Vitreous (Glassy) 
Color
colorless, pale violet, deep violet, red, carmine red 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Collection
Dr. Buford L. Nichols Collection
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Wavellite

#BN47287
Locality
Mt. Ida, Montgomery Co., Arkansas, Unted States 
Formula
Al3(PO4)2(OH)3·5H2
Availability
Available
Price
$75.00
Size
8 x 8 x 3.5 cm - Sm Cabinet 
Tagged
phosphate  

Lime green spheroidal crystals of Wavellite to 7mm across.


Wavellite

Formula
Al3(PO4)2(OH)3·5H2
Crystal System
Orthorhombic 
Crystal Habit
Stellate, Radial, Stalactitic 
Cleavage
Perfect, Good, None 
Luster
Vitreous - Pearly 
Color
blue, brown, brownish black, colorless, green 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Fibrous 
Hardness
3.5-4 
Collection
Dr. Buford L. Nichols Collection
Mineralpedia
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