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Mixed Minerals

Sunday, 13 September 2020 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including acanthite, anglesite, arsenopyrite, bournonite, calcite, and challacolloite and more from places like Durant mine, Aspen dist., Pitkin Co., Colorado, United States, Gemini mine, Eureka, Tintic, Juab Co., Utah, United States, Chatham Cobalt mine, Cobalt, Connecticut, United States, Herodsfoot mine, Liskeard, Cornwall, England, Faraday mine, Hastings Co., Ontario, Canada, and Challacollo mine, Tamarugal prov., Tarapac�, Chile.

Acanthite

with Silver - #AH54064
Locality
Durant mine, Aspen dist., Pitkin Co., Colorado, United States 
Formula
Ag2
Availability
Sold
Size
6.5 x 3 x 3 cm - Sm Cabinet 
Tagged
sulfide , silver  

A heavy mass of dark grey Acanthite with portions of obscure Silver. You have to look hard to see the Silver. An old-timer from the John Albanese collection then to Hampson in 1965.


Acanthite

Formula
Ag2
Crystal System
Monoclinic 
Crystal Habit
Blocky, Skeletal, Arborescent 
Cleavage
poor to none 
Luster
Metallic 
Color
lead gray, gray, iron black 
Streak
shining black 
Class
Monoclinic - Prismatic 
Fracture
Sectile 
Hardness
2-2.5 
Collection
Arnold G Hampson Collection
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Anglesite

on Galena - #WR54052
Locality
Gemini mine, Eureka, Tintic, Juab Co., Utah, United States 
Formula
PbSO4 
Availability
Sold
Size
5 x 4 x 3 cm - Miniature 

One heck-of-a-nice white Anglesite crystal to 8mm in a large vug in Galena.


Anglesite

Formula
PbSO4 
Crystal System
Orthorhombic 
Crystal Habit
Granular, Stalactitic 
Cleavage
Good, Distinct, None 
Luster
Adamantine 
Color
blue, colorless, green, gray, yellow 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5-3 
Collection
Willard L. Roberts Collection
Mineralpedia
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Arsenopyrite

in Quartz - #AH54073
Locality
Chatham Cobalt mine, Cobalt, Connecticut, United States 
Formula
FeAsS 
Availability
Sold
Size
7.5 x 6 x 6 cm - Sm Cabinet 
Tagged
sulfide  

Quartz matrix with Arsenopyrite - no crystals. It is a famous old mine - see this page OLD COBALT MINE IN CHATHAM, CONN - (American Mineralogist). It was collected by Arnold Hampson in 1945.


Arsenopyrite

Formula
FeAsS 
Crystal System
Monoclinic 
Crystal Habit
Striated, Euhedral Crystals, Prismatic 
Cleavage
one distinct 
Luster
Metallic 
Color
tin white, light steel gray 
Streak
black 
Geological Setting
Widespread. Most commonly found in medium to high temperature veins.  
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
5.5 to 6 
Collection
Arnold G Hampson Collection

Bournonite

#WR54043
Locality
Herodsfoot mine, Liskeard, Cornwall, England 
Formula
CuPbSbS3 
Availability
Sold
Size
8 x 5 x 2.5 cm - Sm Cabinet 
Tagged
sulfide , copper  

Perhaps an old-timer from this famous Cornish locality - there are several cogwheel twins of grey, steely crystals of Bournonite to 5mm.


Bournonite

Formula
CuPbSbS3 
Crystal System
Orthorhombic 
Crystal Habit
Platy, Pseudo Cubic, Cog-wheel 
Cleavage
Imperfect, None, None 
Luster
Metallic 
Color
gray, black, steel gray 
Streak
gray 
Class
Orthorhombic - Dipyramidal 
Fracture
Sub Conchoidal 
Hardness
Collection
Willard L. Roberts Collection

Calcite

with included Chalcopyrite - #WR54138
Locality
Faraday mine, Hastings Co., Ontario, Canada 
Formula
CaCO3 
Availability
Sold
Size
5 x 3.5 x 1.7 cm - Miniature 
Tagged
carbonate  

A cleaved Calcite piece with incredible inclusions of Chalcopyrite stringers and unknown "grated" red planes of perhaps alco Chalcopyrite(?). 


Calcite

Formula
CaCO3 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Stalactitic, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
colorless, white, pink, yellow, brown 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Willard L. Roberts Collection
Mineralpedia
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Previously Sold Calcite
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Challacolloite

with Uklonskovite & Pseudoboleite - #52469
Locality
Challacollo mine, Tamarugal prov., Tarapac�, Chile 
Formula
KPb2Cl5 
Availability
Sold
Size
5 x 4 x 3 cm - Miniature 

Colorless plates of Challacolloite to 1mm with liberal amounts scattered with blue Pseudoboleite.


Challacolloite

Formula
KPb2Cl5 
Crystal System
Monoclinic 
Crystal Habit
Aggregates 
Luster
Adamantine - Greasy 
Color
colorless, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Subconchoidal 
Hardness
2-3 

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