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Mixed Minerals

Friday, 08 November 2019 08:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including millerite, and vivianite and more from places like Mitterberg mine, St Johann im Pongau, Salzburg, Austria, and Tomokoni mine, Cornelio Saavedraprov., Potosi, Bolivia.

Millerite

on Siderite - #50373
Locality
Mitterberg mine, St Johann im Pongau, Salzburg, Austria 
Formula
NiS 
Availability
Available
Price
$210.00
Size
8 x 5.5 x 4 cm - Sm Cabinet 
Tagged
nickel  

Fine golden or brassy needles of Millerite to 6mm on brown Siderite. The Millerite is not particularly rich, but there are some nice sprays as seen in the photos. Also in the matrix is Pyrite and Quartz. It has an older handwritten label (prov tab).


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 
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Vivianite

#AH51741
Locality
Tomokoni mine, Cornelio Saavedraprov., Potosi, Bolivia 
Formula
Fe2+3(PO4)2·8H2
Availability
Available
Price
$95.00
Size
5 x 2 x 1.5 cm - Miniature 
Tagged
phosphate  

Sorry for the hideous photos! The subject, did not want to be sold. It is a choice Vivianite crystal with deep emerald color as seen in the last photo where the light is transmitted through the crystal. Surficially it look dark green in hand and best appreciated when held up to the sun or a strong light. 


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
Arnold G Hampson Collection
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