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Mixed Minerals

Sunday, 23 August 2020 07:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including stibnite, vivianite, willemite and more from places like Hampton mine, Antimony dist., Garfield Co., Utah, United States, Siglo Viente mine, Llallagua, Bolivia, Franklin, Sussex Co., New Jersey, United States.

Stibnite

#AH53919
Locality
Hampton mine, Antimony dist., Garfield Co., Utah, United States 
Formula
Sb2S3 
Availability
Sold
Size
11 x 7.5 x 7 cm - Cabinet 
Tagged
sulfide  

A cool hand specimen of compact prismatic crystals which appears to flow like a waterfall down the surface of the matrix. 


Stibnite

Formula
Sb2S3 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Striated, Granular 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
lead gray, bluish lead gray, steel gray, black 
Streak
blackish gray 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
Collection
Arnold G Hampson Collection
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Vivianite

with Childrenite - #AH53924
Locality
Siglo Viente mine, Llallagua, Bolivia 
Formula
Fe2+3(PO4)2·8H2
Availability
Sold
Size
4.5 x 3.5 x 2 cm - Miniature 
Tagged
phosphate  

This is a very impressive specimen of Vivianite once in the collection of Friedrich Ahlfeld, the Father of Bolivian Geology. It was also in the collection of the late Bill Roberts, author of the Encyclopedia of Minerals

The specimen features an excellent deep green Vivianite crystal to 1.4cm. There are several other crystals on the base matrix, but they are frosted over with mostly Pyrite but also Paravauxite and Childrenite. The Childrenite crystals are the brownish red sparkly balls in the photos. The Paravauxite are the light yellow to colorless bladed crystals.


Vivianite

Formula
Fe2+3(PO4)2·8H2
Crystal System
Monoclinic 
Crystal Habit
Divergent, Concretionary, Earthy 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
colorless, green, blue, dark green, dark bluish green 
Streak
bluish white 
Class
Monoclinic - Prismatic 
Fracture
Sectile 
Hardness
1.5-2 
Collection
Willard L. Roberts Collection
Mineralpedia
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Willemite

in Calcite - #AH53926
Locality
Franklin, Sussex Co., New Jersey, United States 
Formula
Zn2SiO4 
Availability
Sold
Size
8.5 x 6.5 x 4 cm - Sm Cabinet 

Olive green crystalline masses of Willemite in Calcite. Collected in 1946 by Arnold Hampson.


Willemite

Formula
Zn2SiO4 
Crystal System
Trigonal 
Crystal Habit
Prismatic, Massive - Granular, Massive 
Cleavage
Poor, Poor, None 
Luster
Vitreous - Resinous 
Color
white, yellow, green, reddish brown, black 
Streak
white 
Class
Trigonal - Rhombohedral 
Fracture
Uneven 
Hardness
5.5 
Collection
Arnold G Hampson Collection
Mineralpedia
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Willemite

var. troostite - #WR53933
Locality
Franklin, Sussex Co., New Jersey, United States 
Formula
Zn2SiO4 
Availability
Sold
Size
7 x 5.5 x 4.5 cm - Sm Cabinet 

Superb large reddish orange crystal of Willemite to 3cm across perched nicely on Calcite. The crystal has a few abrasians, but otherwise looks great. Comes with an old "Grunden Collection" label (see prov. tab).


Willemite

Formula
Zn2SiO4 
Crystal System
Trigonal 
Crystal Habit
Prismatic, Massive - Granular, Massive 
Cleavage
Poor, Poor, None 
Luster
Vitreous - Resinous 
Color
white, yellow, green, reddish brown, black 
Streak
white 
Class
Trigonal - Rhombohedral 
Fracture
Uneven 
Hardness
5.5 
Collection
Willard L. Roberts Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Willemite
On Dakota Matrix
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Mindat
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