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Ore Minerals 3

Tuesday, 30 October 2012 06:00 PM

A favorite subject amongst geologists/mineral collectors, the Ore Minerals SE will have several ore examples from some of the most fmaous mines in the world. Take a look at Ore Minerals  2 for a taste of what Ore Minerals 3 will be like.

Andorite

var. Nakaseite - #PD34292
Locality
Nakase mine, Hyogo pref., Honshu Island, Japan 
Formula
AgPbSb3S6 
Availability
Sold
Size
10 x 11 x 2.5 cm - Cabinet 
Tagged
sulfide  

Mineralized ore sample with fine grained silvery gray Andorite VI variety Nakaseite, named for the Nakase mine, with larger silvery grains of another silvery Sulfide interstitially thoughout Quartz matrix.

There just isn't that much online about the Nakase mine, although according to Mindat it was a Gold mine.


Andorite

Formula
PbAgSb3S6 
Crystal System
Orthorhombic 
Crystal Habit
Striated, Tabular 
Cleavage
None, None, None 
Luster
Metallic 
Color
grayish yellow, dark gray, steel gray 
Streak
black 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3-3.5 
Collection
Phillips Collection
On Dakota Matrix
Previously Sold Andorite
On Dakota Matrix
Other Available Andorite
WebMineral
View Andorite
Mindat
View Andorite

Arsenopyrite

with Jamesonite - #PD34268
Locality
San Jose mine, Oruro dept., Bolivia 
Formula
FeAsS 
Availability
Sold
Size
9 x 9.5 x 11 cm - Cabinet 
Tagged
sulfide  

A large piece of dull-silvery metallic Arsenopyrite with several open Quartz lined vugs with some dark needles of Jamesonite? or possibly Boulangerite? and spherical light blue-green crystals of an unidentified mineral.

Comes with two tags from the Philadelphia Academy of Sciences collection with the corresponding number 19808 on the backside of the specimen. Note, the tags both say Plumosite, which is a term used for any of the silvery filliform minerals i.e Boulangerite, Jamesonite, Cosalite, etc.

The San Jose mine is in the Oruro department, a mining center in Bolivia since the 1600's, and according to one online resource on the History and Geology of the San Jose mine production from 1980 to 1990 was 2820 tonnes Tin, 268 tonnes Silver, 12,500 tonnes Lead, and 5137 tonnes Antimony.


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
Phillips Collection
SOLD
Bastnasite-(Ce) - PD34280
Bastnasite-(Ce) - PD34280

Bastnasite-(Ce)

#PD34280
Locality
Mountain Pass mine, San Bernardino Co., California, United States 
Formula
CeCO3
Availability
Sold
Size
4.5 x 3.5 x 1.5 cm - Miniature 
Tagged
REE mineral  

Sample of Bastnasite ore from Mountain pass with salmon-pink crystalline Bastnasite-Ce mixed with associated carbonates and alteration products.

The Mountain Pass mine is REE carbonatite complex located at the summit of Mountain Pass that currently being operated by Molycorp, who just announced the start-up of their heavy Rare Earth concentrate operations in August 2012.


Bastnasite-(Ce)

Formula
CeCO3
Crystal System
Hexagonal 
Crystal Habit
Prismatic, Massive - Granular 
Cleavage
Imperfect, Indistinct, None 
Luster
Vitreous - Greasy 
Color
yellow, reddish brown 
Streak
white 
Class
Hexagonal - Ditrigonal Dipyramidal 
Fracture
Uneven 
Hardness
4-5 
Collection
Phillips Collection
SOLD
Bastnasite-(Ce) - PD34281
Bastnasite-(Ce) - PD34281

Bastnasite-(Ce)

#PD34281
Locality
Mountain Pass mine, San Bernardino Co., California, United States 
Formula
CeCO3
Availability
Sold
Size
3.5 x 6 x 2 cm - Sm Cabinet 
Tagged
REE mineral  

Another sample of Bastnasite ore from Mountain pass with salmon-pink crystalline Bastnasite-Ce mixed with associated carbonates and alteration products.

The Mountain Pass mine is REE carbonatite complex located at the summit of Mountain Pass that currently being operated by Molycorp, who just announced the start-up of their heavy Rare Earth concentrate operations in August 2012.


Bastnasite-(Ce)

Formula
CeCO3
Crystal System
Hexagonal 
Crystal Habit
Prismatic, Massive - Granular 
Cleavage
Imperfect, Indistinct, None 
Luster
Vitreous - Greasy 
Color
yellow, reddish brown 
Streak
white 
Class
Hexagonal - Ditrigonal Dipyramidal 
Fracture
Uneven 
Hardness
4-5 
Collection
Phillips Collection

Bauxite

#PD34273
Locality
Pulaski Bauxite District, Pulaski Co., Arkansas, United States 
Formula
AlO(OH) 
Availability
Sold
Size
5 x 7 x 5.5 cm - Sm Cabinet 

Sample of Bauxite ore from the Pulaski Bauxite district with the typical texture of Bauxite, with rounded pisolitic grains to 1cm of Gibbsite and the polymorphs Diaspore and Bohmite in shades of brown and orange-brown.

The Bauxite deposits were discovered in Arkansas in 1842 by Dr. W. Byrd Powell and mining began several decades later in 1892 when the peculiur rock was discovered to be an ore of Aluminium. The approximate Bauxite production in Arkansas from 1898 to 2009 is estimated to be 110 million long tons, valued at an estimated $1 billion. For more info see the Encyclopedia of Arkansas-Bauxite Mining page.


Collection
Phillips Collection
On Dakota Matrix
Previously Sold Bauxite
On Dakota Matrix
Other Available Bauxite
WebMineral
View Bauxite
Mindat
View Bauxite

Bornite

with Pyrite - #PD31823
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
Cu5FeS4 
Availability
Sold
Size
9 x 11 x 4 cm - Cabinet 
Tagged
sulfide  

Platy crysals of Bornite with a typical peacock-iridesence with brassy Pyrite.

Founded in 1879 Butte was considered 'The Richest Hill on Earth' and by 1902 17-20% of US Copper production came from Butte. For a great read on the history of Butte check out the DMM article, The Butte Mining District, Butte, Montana - A Summary of the History, Geology and Minerals.


Bornite

Formula
Cu5FeS4 
Crystal System
Orthorhombic 
Crystal Habit
Massive - Granular, Reniform, Granular 
Cleavage
Imperfect, None, None 
Luster
Metallic 
Color
copper red, bronze brown, purple 
Streak
grayish black 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
Collection
Phillips Collection
Mineralpedia
View Bornite
On Dakota Matrix
Previously Sold Bornite
On Dakota Matrix
Other Available Bornite
WebMineral
View Bornite
Mindat
View Bornite

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