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Ore Minerals

Wednesday, 29 June 2022 08:00 AM

Introducing the "Ore Minerals" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including lepidolite, miargyrite, molybdenite, pyrargyrite, pyrrhotite, and scheelite and more from places like Harding mine, Taos Co., New Mexico, United States, Kelly mine, Randsburg dist., San Bernardino Co., California, United States, Swede mine, Pinal Co., Arizona, United States, Colquechaca, Potosi dept., Bolivia, Homestake mine, Lawrence Co., South Dakota, United States, and Jardine mine, Park Co., Montana, United States.

Lepidolite

with Microlite & Spodumene - lithium ore - #AH58548
Locality
Harding mine, Taos Co., New Mexico, United States 
Formula
K(Li,Al)3(Si,Al)4O10(F,OH)2 
Availability
Sold
Size
14 x 13 x 7 cm - Cabinet 
Tagged
ore mineral , pegmatite mineral  

A beautiful specimen of purple Lepidolite associated with white Spodumene crystals collected in 1961 by Arnold Hampson. Both minerals are primary ores of lithium. The spodumene on the specimen measures up to 6cm. Here and there on the specimen yellowish brown Microlite crystals to 3mm can be seen. 


Lepidolite

Formula
K(Li,Al)3(Si,Al)4O10(F,OH)2 
Crystal System
Monoclinic 
Crystal Habit
Platy, Foliated, Massive 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
colorless, gray white, lilac, yellowish, white 
Streak
white 
Class
Monoclinic 
Fracture
Uneven 
Hardness
2.5-3 
Collection
Arnold G Hampson Collection

Miargyrite

- silver ore - #58543
Locality
Kelly mine, Randsburg dist., San Bernardino Co., California, United States 
Formula
AgSbS2 
Availability
Sold
Size
13 x 7.5 x 6 cm - Cabinet 
Tagged
sulfide , ore specimen , silver  

Large silvery mass of nearly all Miargyrite, an ore of Silver. The specimen is a deaccession from Cal Tech. You will never see another large mass of Miargyrite like again.


Miargyrite

Formula
AgSbS2 
Crystal System
Monoclinic 
Crystal Habit
Euhedral Crystals, Disseminated, Massive 
Cleavage
Imperfect, None, None 
Luster
Sub Metallic 
Color
steel gray, lead gray, blackish red, reddish gray 
Streak
cherry red 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
2-2.5 
SOLD
Molybdenite - AH56989
Molybdenite - AH56989

Molybdenite

- molybdenum ore - #AH56989
Locality
Swede mine, Pinal Co., Arizona, United States 
Formula
MoS2 
Availability
Sold
Size
13 x 10 x 8 cm - Cabinet 
Tagged
sulfide , ore specimen  

Large specimen with good coverage of Molybdenite. Molybdenite contains about 60% molybdenum, which is used as a dry lubricant for high temperture applications where oil decompose.


Molybdenite

Formula
MoS2 
Crystal System
Hexagonal 
Crystal Habit
Foliated, Massive, Disseminated 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
black, lead gray, gray 
Streak
greenish gray 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Sectile 
Hardness
Collection
Arnold G Hampson Collection

Pyrargyrite

- silver ore - #58539
Locality
Colquechaca, Potosi dept., Bolivia 
Formula
Ag3SbS3 
Availability
Sold
Size
10 x 8 x 8 cm - Cabinet 
Tagged
sulfide , ore specimen , silver  

Large vuggy specimen of nearly all Pyrargyrite, one of the ruby silvers. Crystals range from 1 to 6mm on this specimen. Pyrargyrite is an important ore and contains about 60% silver but is an uncommon silver ore. An incredible specimen for both bulk and crystals.


Pyrargyrite

Formula
Ag3SbS3 
Crystal System
Trigonal 
Crystal Habit
Massive, Crystalline - Poor, Prismatic 
Cleavage
Poor, None, None 
Luster
Sub Metallic 
Color
deep red, red gray 
Streak
cherry red 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5 

Pyrrhotite

with Cummingtonite in drill core - gold ore - #58565
Locality
Homestake mine, Lawrence Co., South Dakota, United States 
Formula
Fe7S8 
Availability
Sold
Size
17 x 3.5 x 3.5 cm - Cabinet 
Tagged
sulfide , ore specimen  

This is a section of drill core from the Homestake Formation at the Homestake mine. Gold ore from the Homestake mine was hosted in formation, which typicallly contained Pyrrhotite (brassy in the photos) and Arsenopyrite in Cummingtonite schist. 


Pyrrhotite

Formula
Fe7S8 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Platy, Massive - Granular 
Cleavage
Imperfect, Imperfect, None 
Luster
Metallic 
Color
bronze, bronze red, dark brown 
Streak
gray black 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 

Scheelite

- tungsten ore - #58563
Locality
Jardine mine, Park Co., Montana, United States 
Formula
CaWO4 
Availability
Sold
Size
11 x 7 x 3 cm - Cabinet 
Tagged
ore mineral  
Special Info
Fluorescent 

A heavy specimen containing much tungsten from the fluorescent Scheelite ore.

According to the website Legends of America:  Mining and milling of gold and low-grade scheelite ores began again in 1918 and in continued until 1921 when the properties were purchased by the Jardine Mining Company. The new company discovered arsenic and in 1923 built an arsenic plant, which operated almost continuously from 1923 to 1926, then intermittently until 1945. The mill continued to process various ores until 1948 when a fire destroyed the cyanide plant and the Jardine Mining Company closed the mill.


Scheelite

Formula
CaWO4 
Crystal System
Tetragonal 
Crystal Habit
Massive - Granular, Disseminated, Columnar 
Cleavage
Distinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, white, pale yellow, brownish yellow, reddish yellow 
Streak
white 
Class
Tetragonal - Dipyramidal 
Fracture
Uneven 
Hardness
4-5 
Special Info
Fluorescent
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