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Fine Minerals for Sale from Butte, Montana

Friday, 23 December 2016 06:00 PM

Rare Mineral Specimens from the Butte District in Montana. Read all about Butte mining history, geology and minerals.

Fluorapatite

with Quartz - #45925
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
Ca5(PO4)3
Availability
Sold
Size
3.5 x 2.5 x 1 cm - Miniature 
Tagged
phosphate  

Thumbnail size specimen with a "large" (for Butte) 6mm partial Fluorapatite crystal on needle Quartz. There are actually two crystals both having beveled edges of a pyramid. Amongst the Quartz crystals are these tiny well-formed Bornite crystals to about 1mm. 


Fluorapatite

Formula
Ca5(PO4)3
Crystal System
Hexagonal 
Crystal Habit
Massive - Granular, Euhedral Crystals 
Cleavage
Indistinct, None, None 
Luster
Vitreous - Resinous 
Color
blue, brown, colorless, violet, green 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Chris van Laer Collection

Fluorite

with Pyrite & Quartz - #45852
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
CaF2 
Availability
Sold
Size
5.5 x 3 x 2.5 cm - Sm Cabinet 

Purple crystals of Fluorite cubes less than 1mm in size associated with Pyrite and Quartz.


Fluorite

Formula
CaF2 
Crystal System
Isometric 
Crystal Habit
Crystalline - Coarse, Massive - Granular, Disseminated 
Cleavage
Three perfect, octahedral cleavages. 
Luster
Vitreous (Glassy) 
Color
purple, clear, yellow, green, red, blue 
Streak
white 
Geological Setting
Occurs in a wide range of geologic environments including low temperature Missississippi Valley lead-zinc deposits, hydrothermal gold deposits, Alpine cleft metamorphic environments  
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
Collection
Chris van Laer Collection
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Gold

with Cerargyrite & Bornite - #45863
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
Au 
Availability
Sold
Size
6.5 x 5 x 3.5 cm - Sm Cabinet 
Tagged
native element  

1-2mm Gold scales on dark, tarnished Bornite crystals. Although the ores of the Butte district were first discovered because of the placer Gold, it quite rare in the district as free visible Gold. Most of the Gold produced from the mines was a byproduct of the copper ores. This specimen, is obviously a one-of-a-kind rare specimen. There is a little dark green waxy Cerargyrite also.


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 
Collection
Chris van Laer Collection
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Gypsum

var. selenite - #45857
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
CaSO4·2H2
Availability
Sold
Size
6 x 6 x 3 cm - Sm Cabinet 

For selenite this is a fairly nice specimen. The crystals are long, thin bladed to 2cm and occur as radial sprays in Pyrite-Chalcocite matrix.


Gypsum

Formula
CaSO4·2H2
Crystal System
Monoclinic 
Crystal Habit
Tabular, Crystalline - Coarse, Massive - Fibrous 
Cleavage
Perfect, Distinct, Distinct 
Luster
Pearly 
Color
white, colorless, yellowish white, greenish white, brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Fibrous 
Hardness
Collection
Chris van Laer Collection
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Gypsum

with Enargite & Pyrite - #45923
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
CaSO4·2H2
Availability
Sold
Size
5.5 x 3.5 x 2 cm - Sm Cabinet 

Bladed crystals to 3cm of selenite Gypsum with some Pyrite and Enargite crystals on the back side.


Gypsum

Formula
CaSO4·2H2
Crystal System
Monoclinic 
Crystal Habit
Tabular, Crystalline - Coarse, Massive - Fibrous 
Cleavage
Perfect, Distinct, Distinct 
Luster
Pearly 
Color
white, colorless, yellowish white, greenish white, brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Fibrous 
Hardness
Collection
Chris van Laer Collection
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Pyrite

with Djurleite - #45849
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
FeS2 
Availability
Sold
Size
6.5 x 5 x 4 cm - Sm Cabinet 
Tagged
sulfide  

This specimen is much like the previous Djurleite with Pyrite, however this piece is much bigger. It features mainly beautifully iridescent Pyrite as crystals to 1cm. Amongst the Pyrite crystals lie fabulous little 1-4mm pseudohexagonal, sharp, silvery Djurleite crystals. Brochantite is also present.


Pyrite

Formula
FeS2 
Crystal System
Isometric 
Crystal Habit
Striated, Druse, Stalactitic 
Cleavage
Poor, Poor, None 
Luster
Metallic 
Color
pale brass yellow 
Streak
greenish black 
Class
Isometric - Diploidal 
Fracture
Conchoidal 
Hardness
6.5 
Collection
Chris van Laer Collection
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