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Ore Minerals 6

Friday, 25 January 2019 05:00 PM

A wide array of excellent, rich, and large ore minerals from classical mining districts the world over will be presented.

Chalcopyrite

with Magentite - #RW50121
Locality
Tyrone mine, Grant Co., New Mexico, United States 
Formula
Cu1+Fe3+S2 
Availability
Sold
Size
9 x 6 x 4 cm - Sm Cabinet 
Tagged
ore mineral , sulfide , copper  

Chalcopyrite is one of the most important and common ores of Copper. It contains about 34% Copper. Like this specimen it exhibits a bright goldish color when fresh and can be iridescent upon long exposure to air.  Chalcoppyrite can alter to Covellite along fractures. Shown together with Pyrite, it is easy to distinguish the two apart. Pyrite will be a lesser gold color. In fact it can be confused with Gold when in small grains in matrix. However a little scratch test with a blade will show that Chalcopyrite is brittle and Gold is malleable. 

This chunk of Copper ore contains about 60% Chalcopyrite and 20-30% Magnetite (glossy black grains). Knowing that the specimen contains Magnetite (with a magnet), gives a clue to the identity of Chalcopyrite since both contain Iron.


Chalcopyrite

Formula
Cu1+Fe3+S2 
Crystal System
Tetragonal 
Crystal Habit
Euhedral Crystals, Striated, Druse 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
brass yellow, honey yellow 
Streak
greenish black 
Class
Tetragonal - Scalenohedral 
Fracture
Brittle 
Hardness
3.5 
Collection
Robert J. Waidler Collection

Cobaltite

#RW50115
Locality
Espanola, Ontario, Canada 
Formula
CoAsS 
Availability
Sold
Size
6.5 x 5 x 4 cm - Sm Cabinet 
Tagged
ore mineral , sulfide  

Ex. Mike Groben specimen with several embedded cubic crystals from 5 to 8mm. Cobaltite is the promary ore of Cobalt. It is most commonly in high temperature deposits. Cobaltite contains  32% Cobalt. It usually occurs as disseminations in metamorphic rocks or in vein deposits with Cobalt and Nickel sulfides.


Cobaltite

Formula
CoAsS 
Crystal System
Orthorhombic 
Crystal Habit
Massive - Granular, Striated, Granular 
Cleavage
Good, Good, Good 
Luster
Metallic 
Color
reddish silver white, violet steel gray, black 
Streak
grayish black 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle 
Hardness
5.5 
Collection
Robert J. Waidler Collection
SOLD
Cobaltite - RW50117
Cobaltite - RW50117

Cobaltite

#RW50117
Locality
Castle-Trethewey mine, Cobalt, Haultain Twp,.Ontario, Canada 
Formula
CoAsS 
Availability
Sold
Size
7 x 5.5 x 5.5 cm - Sm Cabinet 
Tagged
ore mineral , sulfide  

A large mass of nearly pure Cobaltite. Cobalt is predominately use in metallurgical applications such as super alloys in jet engines. 


Cobaltite

Formula
CoAsS 
Crystal System
Orthorhombic 
Crystal Habit
Massive - Granular, Striated, Granular 
Cleavage
Good, Good, Good 
Luster
Metallic 
Color
reddish silver white, violet steel gray, black 
Streak
grayish black 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle 
Hardness
5.5 
Collection
Robert J. Waidler Collection

Copper

#RW50119
Locality
Cole Shaft, Bisbee, Cochise Co., Arizona, United States 
Formula
Cu 
Availability
Sold
Size
11 x 7 x 6 cm - Cabinet 
Tagged
ore mineral , copper  

This is a big ugly chunk of pure Copper.  Still impressive!


Copper

Formula
Cu 
Crystal System
Isometric 
Crystal Habit
Nodular, Arborescent 
Cleavage
None, None, None 
Luster
Metallic 
Color
brown, copper red, light pink, red 
Streak
rose 
Class
Isometric - Hexoctahedral 
Fracture
Hackly 
Hardness
2.5-3 
Collection
Robert J. Waidler Collection
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Cylindrite

#RW50116
Locality
Trinacria mine, Poopo, near Oruro, Bolivia 
Formula
FePb3Sn4Sb2S14 
Availability
Sold
Size
6.5 x 5 x 3 cm - Sm Cabinet 
Tagged
ore mineral , sulfide , tin  

Cylindrite must be one of the strangest crystal forms in the mineral kingdom. The crystals are like the name suggest - cylinders. On this specimen the crystals are abundant and reach around 1cm. It is an ore of tin but also contain lead, iron and antimony.


Cylindrite

Formula
FePb3Sn4Sb2S14 
Crystal System
Triclinic 
Crystal Habit
Cylindrical, Radial 
Cleavage
None, None, None 
Luster
Metallic 
Color
lead gray, grayish black 
Streak
black 
Class
Triclinic - Pinacoidal 
Fracture
Malleable 
Hardness
2.5 
Collection
Robert J. Waidler Collection
SOLD
Djurleite - RW48168
Djurleite - RW48168

Djurleite

#RW48168
Locality
Nakauri mine, Aichi prefecture, Honshu Island, Japan 
Formula
Cu31S16 
Availability
Sold
Size
5 x 5 x 3 cm - Miniature 
Tagged
ore mineral , sulfide , copper  

Black massive specimen of pure Digenite, an ore of Copper containg 78.1% Cu.


Djurleite

Formula
Cu31S16 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Tabular, Massive - Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
lead gray, blue black, black, black gray 
Streak
metallic 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
2.5-3 
Collection
Robert J. Waidler Collection

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