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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 malhmoodite, matildite, and whitmoreite and more from places like Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States, Clara mine, Wolfach, Schwarzwald, Baden-Wurttemberg, Germany, and Big Chief mine, Pennington Co., South Dakota, United States.

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

Whitmoreite

with Ludlamite - #62916
Locality
Big Chief mine, Pennington Co., South Dakota, United States 
Formula
Fe2+Fe3+2(PO4)2(OH)2·4H2
Availability
Available
Price
$50.00
Size
6.5 x 5 x 4 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

Brown acicular crystals eminating from a round crystal. I have never seen analytics on the rounded center, but I assume they are also Whitmoreite. Bill Roberts once described the Whitmoreite crystals as "floating naval mines". There are several areas which show the Whitmorerite in a matrix of Ludlamite, Hureaulite, Phosphoferrite(?) and Arsenopyrite.


Whitmoreite

Formula
Fe2+Fe3+2(PO4)2(OH)2·4H2
Crystal System
Monoclinic 
Crystal Habit
Acicular, Radial, Aggregates 
Cleavage
Good, None, None 
Luster
Vitreous - Adamantine 
Color
brown, greenish brown, light yellow brown, dark brown 
Class
Monoclinic - Prismatic 
Hardness

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