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Ore Minerals 2

Friday, 06 January 2012 02:00 PM

Ore Minerals from historic mining camps. Learn more about Special Editions. View Upcoming Special Editions. To get NOTIFIED click here to get the exclusive DAKOTA MATRIX NOTIFIER.

Molybdenite

Pyrite and Quartz - #30659
Locality
Goat Creek, Sanders Co., Montana, United States 
Formula
MoS2 
Availability
Sold
Size
9 x 5 x 2.5 cm - Sm Cabinet 

There are three core splits in this set. Each split represents a different interval of diamond drill hole #1: at 182 ft, 334 ft, and 418 ft. I believe these splits represent one of the ten holes drilled by Noranda in 1974 after discovery in 1967. Good geological work and surface sampling enabled the discovery of the deposit. Goat Creek is a large, deep low grade Molybdenum deposit with skarn mineralization, including tungsten. Mineralization was in the Belt strata of the Wallace Formation and within a highly differentiated, non-outcropping Tertiary pluton (J. E. Worthington of the Idaho Geological Survey). The core shows good mineralization of Molybdenite and Pyrite in Quartz veining.


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

#30655
Locality
Nunatak prospect at Muir Inlet, Juneau dist., Alaska 
Formula
MoS2 
Availability
Sold
Size
7 x 5 x 5 cm - Sm Cabinet 
Tagged
Ore Minerals  

The Nunatak Molybdenum deposit consists of stockworks of quartz-molybdenite veins in skarn forming a large low-grade molybdenum deposit. The deposit was discovered and staked in 1941. The molybdenum mineralization consists mostly of closely-spaced quartz veins containing rosettes of Molybdenite crystal much like this specimen. The rosettes on this specimen are to 2cm across.


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

Molybdenite

#30653
Locality
Los Chicharones prospect, Sinaloa, Mexico 
Formula
MoS2 
Availability
Sold
Size
8 x 6 x 3 cm - Sm Cabinet 
Tagged
Ore Minerals  

This locality is not necessarily an ore deposit that I am aware of, but the occurrence certainly exemplifies the natures of some of the ore textures found in copper porphyries. This specimen shows good colloform habit of Quartz veins lined with flakes of Molybdenite and Pyrite. There are three pieces that come with this specimen.


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

Nickeline

Rammelsbergite and Safflorite - #30649
Locality
Bear Meadow Adit, Quartz Hill deposit, Ketchikan district, Alaska, United States 
Formula
NiAs 
Availability
Sold
Size
11.5 x 6 x 3 cm - Cabinet 
Tagged
Ore Minerals  

All of the Cobalt specimens in this update probably originated from a study conducted in the 1960's. The results were summarized in the landmark publication "The Silver - Arsenides Deposits of the Cobalt-Gowganda Region, Ontario" edited by L. G. Berry with major contributions by W. Petruk and J. L. Jambor. On page 108, Petruk describes the five assemblages of mineralization at Cobalt. This specimen clearly fits into group #1, the Nickel-Arsenide assemblage characterized by complex botryoidal masses of Nickeline inter-growths with Breithauptite, Safflorite and Cobaltite. The minerals form concentric layers and it would be impossible to differentiate visually all the minerals without a thorough microprobe study. Looking closely at the ore, one can see the plumose-texture characteristic of all of these ore specimens. It is sawed flat and polished on one side.


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
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Nickeline

Breithauptite - #PD30650
Locality
Cobalt-Gowganda dist., Ontario, Canada 
Formula
NiAs 
Availability
Sold
Size
9 x 7 x 2 cm - Sm Cabinet 
Tagged
Ore Minerals  

Classic nickel arsenide assemblage as described by Petruk in "The Silver-Arsenide Deposits of Cobalt...", This specimen shows the plumose ore texture so typical of Cobalt but mostly composed of brassy colored Breithauptite and Nickeline with a distinct rose hue. This assemblage was found most prevalent in at the ends, tops and bottoms of most veins. Excellent specimen showing also the Dolomitic gangue. It is sawed flat on one side and shows natural breakage on the other.


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
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Nickeline

Safflorite and Siderite - #PD30643
Locality
Hi-Ho Silver mine, Cobalt dist., Ontario, Canada 
Formula
NiAs 
Availability
Sold
Size
6.5 x 4 x 1 cm - Sm Cabinet 

The Cobalt district is located within the Superior structural province of the Canadian Shield. Two distinct suites of minerals and age of mineralization occur throughout the region. The older are base metal sulfides associated with Archean volcanics and are classified as stratiform and syngenetic. The younger are the ore suites consisting of silver-cobalt-nickel-arsenic assemblages hosted within Archean volcanics and Huronian rocks and are fissure fillings and replacement veins. It was found through detailed research of ore samples that five typical assemblages of arsenides occur in specific parts of the ore veins at Cobalt. This specimen belongs to group 2, the Ni-Co-As assemblage, which typically contains a high Silver content and a predominance of nickel and cobalt arsenides. These assemblages were defined by William Petruk in the 1960's and published in "The Silver-Arsenide Deposits of the Cobalt-Gowganda Region, Ontario" (MAC). This specimen contains abundant Nickeline and Safflorite. It is a sawed and polished on one side which shows well the rosettes and veinlets of the ore minerals.


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

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