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Ore Mineral Specimens 4

Tuesday, 29 September 2015 03:00 PM

Introducing the "Ore Mineral Specimens 4" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including molybdenite, nickeline, pyrite, and silver and more from places like Black Lion prospect, Pioneer District, Beaverhead Co., Montana, United States, Walton prospect, Custer Co., Montana, United States, Balmat, St. Lawrence Co., New York, United States, Cobalt-Gowganda dist., Ontario, Canada, Excelsior mine, Cerro de Pasco, Pasco dept., Peru, and Mun. de Sombrerete, Zacatecas, Mexico.

Molybdenite

with Ferrimolybdenite - #PD42811
Locality
Black Lion prospect, Pioneer District, Beaverhead Co., Montana, United States 
Formula
MoS2 
Availability
Sold
Size
10 x 7 x 3.5 cm - Cabinet 
Tagged
sulfide  

An excellent ore specimen showing a lot of crystalline Molybdenite as veining and in pockets associated with the alteration product, Ferrimolybdenite. There is an excellent USGS report can be located in USGS Bulletin 1766: Mineral Resources of the Eastern Pioneer Mountains, Beaverhead County, Montana

The USA nad China holds the bulk of molybdenum reserves. US mine production has historically been a by-product of copper. According to the USGS commodity report, in 2014, molybdenum was produced from 13 mines. Moly was a primary product from three mines and a by-product of copper mining at the other 10 mines in Arizona, Nevada, New Mexico, and Montana from low-grade porphyry deposits. It is primarily used as an alloy in steel and cast iron and there is little to no substitution for its superior alloying properties.


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

Molybdenite

#42812
Locality
Walton prospect, Custer Co., Montana, United States 
Formula
MoS2 
Availability
Sold
Size
9 x 7 x 4 cm - Sm Cabinet 
Tagged
sulfide  

Mostly Quartz with 1-11mm Molybdenite crystals.

There are few substitutes for molybdenum in the manufacture of alloyed steels and cast irons. Because of its usefulness and availability, the industry is researching and developing new applications. It is possible that boron, chromium, niobium, and vanadium can subsitute for molybdenum in steel alloys.


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

Molybdenite

in Talc - #PD42823
Locality
Balmat, St. Lawrence Co., New York, United States 
Formula
MoS2 
Availability
Sold
Size
15 x 12.5 x 5 cm - Cabinet 
Tagged
sulfide  

Silvery layers of greasy feeling Molybdenite on Talc. It is a large specimen and will likely cost a little extra to ship.

The Balmat zinc mining district has produced 43 million tons of 9.4% zinc ore in its 87 year span from metamorphosed Precambrian Middle-Proterozoic siliceous dolomitic marbles according to Richard Knight of St. Lawrence Zinc Company of Hailesboro, New York.


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
Phillips Collection
SOLD
Nickeline - PD42814
Nickeline - PD42814

Nickeline

#PD42814
Locality
Cobalt-Gowganda dist., Ontario, Canada 
Formula
NiAs 
Availability
Sold
Size
6 x 3.5 x 4.5 cm - Sm Cabinet 
Tagged
sulfide  

A solid chunk of massive, metallic Nickeline from this famous, historic mining district. 

Discovery of large mineable sulfide deposits that contain nickel have not been discovered in recent years, which have forced exploration geologist to investigate more challenging prospects like the Subartic. Ocean floor manganese crusts and nodules contain extensive nickel resources and about 60% of the current land-based resources are found in laterites.  All this and much more can be found in the USGS 2015 Commodity report.


Nickeline

Formula
NiAs 
Crystal System
Hexagonal 
Crystal Habit
Massive, Reniform, Columnar 
Cleavage
Imperfect, Imperfect, None 
Luster
Metallic 
Color
lead gray, grayish, copper, black 
Streak
brownish black 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Uneven 
Hardness
5.5 
Collection
Phillips Collection
Mineralpedia
View Nickeline
On Dakota Matrix
Previously Sold Nickeline
On Dakota Matrix
Other Available Nickeline
WebMineral
View Nickeline
Mindat
View Nickeline

Pyrite

#PD42900
Locality
Excelsior mine, Cerro de Pasco, Pasco dept., Peru 
Formula
FeS2 
Availability
Sold
Size
6.5 x 6 x 4 cm - Sm Cabinet 
Tagged
sulfide  

Though not an ore mineral, the specimen is from an ore-producing mine. The original label states that there is Chalcopyrite in the specimen. I have not seen this and the mass is mostly iridescent Pyrite.


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

Silver

with Bornite - #PD36337
Locality
Mun. de Sombrerete, Zacatecas, Mexico 
Formula
Ag 
Availability
Sold
Size
5 x 3 x 0.2 cm - Miniature 
Tagged
native element  

Leaf Silver with a fine coating of Bornite.


Silver

Formula
Ag 
Crystal System
Isometric 
Crystal Habit
Arborescent, Dendritic, Massive 
Cleavage
None, None, None 
Luster
Metallic 
Color
silver white, gray white, gray 
Streak
silver white 
Class
Isometric - Hexoctahedral 
Fracture
Hackly 
Hardness
2.5-3 
Collection
Phillips Collection
Mineralpedia
View Silver
On Dakota Matrix
Previously Sold Silver
On Dakota Matrix
Other Available Silver
WebMineral
View Silver
Mindat
View Silver

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