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Systematic & Rare Minerals

Friday, 01 December 2023 04:00 PM

Introducing the "Systematic & Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including gold, malhmoodite, matildite, millerite, phosphosiderite, and tochilinite and more from places like Bessie G mine, La Plata Co., Colorado, United States, Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States, Clara mine, Wolfach, Schwarzwald, Baden-Wurttemberg, Germany, Eugenia mine, Tarragona, Catalonia, Spain, Bull Moose mine, Custer Co., South Dakota, United States, and Cornwall Iron mine, Lebanon Co., Pennsylvania, United States.

Gold

with Goldfieldite - #58672
Locality
Bessie G mine, La Plata Co., Colorado, United States 
Formula
Au 
Availability
Sold
Size
3 x 2.2 x 1.2 cm - Thumbnail 
Tagged
native element  

Gold grains with dull silvery grey Goldfieldite. Acquired from Dr. Jaroslav Hrysl.


Gold

Formula
Au 
Crystal System
Isometric 
Crystal Habit
Arborescent, Platy, Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
yellow, pale yellow, orange, yellow white, reddish white 
Streak
yellow 
Class
Isometric - Hexoctahedral 
Fracture
Hackly 
Hardness
2.5-3 
Mineralpedia
View Goldmanite
On Dakota Matrix
Previously Sold Gold
On Dakota Matrix
Other Available Gold
WebMineral
View Gold
Mindat
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Malhmoodite

#BAC62823
Locality
Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States 
Formula
Fe2+Zr(PO4)2·4H2
Availability
Available
Price
$40.00
Size
2.4 x 1.7 x 2 cm - Thumbnail 
Tagged
phosphate  
Special Info
Type Locality 

Tiny creamy white balls of Malhmoodite, less than 0.3mm in vuggy matrix. I couldn't photo all but there are at least four of them.


Malhmoodite

Formula
Fe2+Zr(PO4)2·4H2
Crystal System
Monoclinic 
Cleavage
Good, None, None 
Luster
Silky 
Color
cream white 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
Collection
William & Anne Cook Collection
Special Info
Type Locality

Matildite

#KR61985
Locality
Clara mine, Wolfach, Schwarzwald, Baden-Wurttemberg, Germany 
Formula
AgBiS2 
Availability
Available
Price
$125.00
Size
2.3 x 2.2 x 1.5 cm - Thumbnail 
Tagged
sulfide , silver  

Tiny rod-like crystals to 0.5mm throughout matrix, but sparse.


Matildite

Formula
AgBiS2 
Crystal System
Trigonal 
Crystal Habit
Acicular, Massive - Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
gray, iron black 
Streak
light gray 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Uneven 
Hardness
2.5 
Collection
William & Anne Cook Collection

Millerite

with Polydymite - #BAC62927
Locality
Eugenia mine, Tarragona, Catalonia, Spain 
Formula
NiS 
Availability
Available
Price
$25.00
Size
3 x 2.5 x 2 cm - Thumbnail 
Tagged
sulfide , nickel  

Acicular Millerite in a tiny spray and brassy, long needles in sulfide matrix.


Millerite

Formula
NiS 
Crystal System
Trigonal 
Crystal Habit
Acicular, Massive 
Cleavage
Perfect, Perfect, None 
Luster
Metallic 
Color
bronze, greenish gray, gray, brass yellow 
Streak
greenish black 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Uneven 
Hardness
3-3.5 
Collection
William & Anne Cook Collection
Mineralpedia
View Millerite
On Dakota Matrix
Previously Sold Millerite
On Dakota Matrix
Other Available Millerite
WebMineral
View Millerite
Mindat
View Millerite

Phosphosiderite

with Strengite - #62912
Locality
Bull Moose mine, Custer Co., South Dakota, United States 
Formula
Fe3+PO4·2H2
Availability
Sold
Size
6 x 5 x 5 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

Two light red terminated crystals of Phosphosiderite with purple Strengite in black Barbosalite matrix.


Phosphosiderite

Formula
Fe3+PO4·2H2
Crystal System
Monoclinic 
Crystal Habit
Encrustations, Spherical 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, purple, pink, red, red violet 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 

Tochilinite

#BAC62828
Locality
Cornwall Iron mine, Lebanon Co., Pennsylvania, United States 
Formula
6(Fe0.9S)·5[(Mg,Fe)(OH)2
Availability
Available
Price
$40.00
Size
5.5 x 4 x 2.5 cm - Sm Cabinet 

Black acicular crystals in radiating groups.


Tochilinite

Formula
6(Fe0.9S)·5[(Mg,Fe)(OH)2
Crystal System
Monoclinic 
Crystal Habit
Radial, Cylindrical, Acicular 
Cleavage
Distinct, None, None 
Luster
Metallic 
Color
bronze black 
Class
Monoclinic 
Hardness
1-1.5 
Collection
William & Anne Cook Collection

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