Ore Minerals, part 1

SOLD

Covellite

with Pyrite - #62064

Details
Data
Provenance
Resources

Locality: Butte dist., Silver Bow Co., Montana, United States
Formula: CuS
Availability: Sold
Size: 8.5 x 5.5 x 2.5 cm - Sm Cabinet
Tagged: ore mineral , sulfide , copper

A juicy specimen loaded with 66% copper and is a beautiful indigo blue color. Covellite is formed in supergene of copper porphyry deposits and hydrothermal deposits, such as Butte, Montana. There is also Pyrite in the matrix giving it a nice contrasting appearance.

Covellite

Formula: CuS
Crystal System: Hexagonal
Crystal Habit: Platy, Foliated
Cleavage: Perfect, None, None
Luster: Metallic
Color: indigo blue, light blue, dark blue, black
Streak: black gray
Class: Hexagonal - Dihexagonal Dipyramidal
Fracture: Brittle
Hardness: 1.5-2

Mineralpedia: View Covellite
On Dakota Matrix: Previously Sold Covellite
On Dakota Matrix: Other Available Covellite
WebMineral: View Covellite
Mindat: View Covellite

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Enstatite

var. bronzite, (Platinum ore) - #62098

Details
Data
Provenance
Resources

Locality: Stillwater mine, Nye Co., Montana, United States
Formula: MgSiO₃
Availability: Sold
Size: 10 x 5.5 x 3.5 cm - Cabinet
Tagged: ore mineral , platinum

Stillwater is the only operating platinum/palladium deposit in the USA. In this specimen the platinum is located in the bronzite, a variety of Enstatite. It is shown in the second photo and smaller areas of the other photos along with some sulfide mineralization. The note that came with the specimen says "extremely high grade platinum ore". There are sulfides throughout the matrix, and I have not bothered to really scrutinize the specimen. So, ponder that and know that the Stillwater complex is home to 7 type locality minerals.

Enstatite

Formula: MgSiO₃
Crystal System: Orthorhombic
Crystal Habit: Massive - Fibrous, Lamellar
Cleavage: Distinct, Distinct, None
Luster: Vitreous - Pearly
Color: white, yellowish green, brown, greenish white, gray
Streak: gray
Class: Orthorhombic - Dipyramidal
Fracture: Brittle
Hardness: 5.5

Mineralpedia: View Enstatite
On Dakota Matrix: Previously Sold Enstatite
On Dakota Matrix: Other Available Enstatite
WebMineral: View Enstatite
Mindat: View Enstatite

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Galena

#RW57364

Details
Data
Provenance
Resources

Locality: Ozark-Mahoning mine, Hardin Co., Illinois, United States
Formula: PbS
Availability: Sold
Size: 6.5 x 4 x 3 cm - Sm Cabinet
Tagged: ore mineral , sulfide

The specimen has large crystals to 3.5cm exhibiting nice cubic formations.

Galena

Formula: PbS
Crystal System: Isometric
Crystal Habit: Euhedral Crystals, Massive - Granular, Massive
Cleavage: Perfect, Perfect, Perfect
Luster: Metallic
Color: light lead gray, dark lead gray
Streak: grayish black
Class: Isometric - Hexoctahedral
Fracture: Brittle
Hardness: 2.5

Collection: Robert J. Waidler Collection

Mineralpedia: View Galena
On Dakota Matrix: Previously Sold Galena
On Dakota Matrix: Other Available Galena
WebMineral: View Galena
Mindat: View Galena

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Guettardite

#AH62112

Details
Data
Provenance
Resources

Locality: Brobdignag mine, Red Mtn. dist., San Juan Co., Colorado, United States
Formula: Pb(Sb,As)₂S₄
Availability: Sold
Size: 11 x 7 x 5 cm - Cabinet
Tagged: ore mineral , sulfide

A large specimen of silvery, massive Guettardite and probably contains some Zinkenite. It is encased in Siderite. Hampson collected this specimen in 1977. Specimens of Guettardite are rarely seen on the market. This is an exceptional specimen. It is an ore of lead, but since it is a rare mineral, it cannot be regarded as an important source of lead.

Guettardite

Formula: Pb(Sb,As)₂S₄
Crystal System: Monoclinic
Crystal Habit: Acicular, Anhedral Grains
Cleavage: Perfect, None, None
Luster: Metallic
Color: grayish black
Streak: brownish
Class: Monoclinic - Prismatic
Fracture: Brittle - Conchoidal
Hardness: 4

Collection: Arnold G Hampson Collection

On Dakota Matrix: Previously Sold Guettardite
On Dakota Matrix: Other Available Guettardite
WebMineral: View Guettardite
Mindat: View Guettardite

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Halite

#62056

Details
Data
Provenance
Resources

Locality: Windsor, Essex Co., Ontario, Canada
Formula: NaCl
Availability: Sold
Size: 6 x 4.5 x 3 cm - Sm Cabinet

Waterclear cubic Halite crystals. Halite (salt) occurs in evaporite deposits, forming deposits reaching thicknesses of hundreds if not thousands of feet. It is also found as salt domes also known as diapirs.

Halite

Formula: NaCl
Crystal System: Isometric
Crystal Habit: Euhedral Crystals, Granular, Crystalline - Coarse
Cleavage: Perfect, Perfect, Perfect
Luster: Vitreous (Glassy)
Color: white, clear, light blue, dark blue, pink
Streak: white
Class: Isometric - Hexoctahedral
Fracture: Brittle
Hardness: 2.5

Collection: RC Stamberg Collection

Mineralpedia: View Halite
On Dakota Matrix: Previously Sold Halite
On Dakota Matrix: Other Available Halite
WebMineral: View Halite
Mindat: View Halite

SOLD

Hematite

#RW62067

Details
Data
Provenance
Resources

Locality: Soudan mine, Vermilion Range, St. Louis Co., Minnesota, United States
Formula: Fe₂O₃
Availability: Sold
Size: 9 x 8 x 6 cm - Sm Cabinet
Tagged: ore mineral

This is more or less and fine-grained or specular Hematite specimen. It is one of the major ores of the district. Unfortunately the glory days of this district are long gone. It use to drive the once huge steel industry of the USA sending ore to the steel mills of south Chicago, Pittsburg and Cleveland.

Hematite

Formula: Fe₂O₃
Crystal System: Trigonal
Crystal Habit: Tabular, Blocky, Earthy
Cleavage: None, None, None
Luster: Metallic
Color: reddish gray, black, blackish red
Streak: reddish brown
Class: Trigonal - Hexagonal Scalenohedral
Fracture: Conchoidal
Hardness: 6.5

Collection: Robert J. Waidler Collection

Mineralpedia: View Hematite
On Dakota Matrix: Previously Sold Hematite
On Dakota Matrix: Other Available Hematite
WebMineral: View Hematite
Mindat: View Hematite

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