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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.

Molybdenite

#50104
Locality
Henderson mine, Clear Creek Co., Colorado, United States 
Formula
MoS2 
Availability
Sold
Size
18 x 9 x 10 cm - Cabinet 
Tagged
ore mineral , sulfide  

This is a large, very impressive, mass of Molybdenite in vein fillings in porphyry ore.  

About 99% of the world's production of Molybdenum is derived from Molybdenite. It is used as a dry lubricant, chemical reagents, in the glass and ceramics industry, and as flame retardants.


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
Chris van Laer Collection

Perovskite

#RW50122
Locality
Dallas Gem mine, San Benito Co., California, United States 
Formula
CaTiO3 
Availability
Sold
Size
7 x 4 x 4.5 cm - Sm Cabinet 
Tagged
ore mineral  

Titanium is corrosion resistant and used in materials that need to be high strength and light weight. Alloys of Titanium are capable of withstanding high temperatures and thus used in many aerospace applications. Important ores of Titanium are Ilmenite (31.6% Ti) and Rutile (60% Ti). Although Perovskite contains more Titanium (35%), than Ilmenite, it is not as common as Ilmenite, and thus not an important ore. Important ore sources are Western Australia, Canada, and China.

This specimen contains abundant Perovskite as tiny cubic crystals up to 3mm.

 


Perovskite

Formula
CaTiO3 
Crystal System
Orthorhombic 
Crystal Habit
Reniform, Pseudo Cubic, Pseudo Hexagonal 
Cleavage
Good, Good, Good 
Luster
Sub Metallic 
Color
black, reddish brown, pale yellow, yellowish orange 
Streak
grayish white 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
5.5 
Collection
Robert J. Waidler Collection
SOLD
Pyrolusite - RW50123
Pyrolusite - RW50123

Pyrolusite

#RW50123
Locality
Narysov, Pribram, Central Bohemia, Czech Republic 
Formula
MnO2 
Availability
Sold
Size
6 x 5 x 4 cm - Sm Cabinet 
Tagged
ore mineral  

Divergent black, silvery crystals in a group to 4cm. An excellent specimen for anyone's collection of ore minerals.

Pyrolusite is the most important ore of Manganese and contains 63.2% Mn. It is used in steel as it improves rolling and forging qualities, while giving steel strength, stiffness, wear resistance, and hardness. It is also used in dry cell bateries and as a decolorizer in glass.


Pyrolusite

Formula
MnO2 
Crystal System
Tetragonal 
Crystal Habit
Reniform, Dendritic, Earthy 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
steel gray, iron gray, bluish gray 
Streak
black 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Brittle 
Hardness
6-6.5 
Collection
Robert J. Waidler Collection

Rammelsbergite

with Nickeline & Safflorite - #RW50109
Locality
Langis mine, Cobalt dist., Ontario, Canada 
Formula
NiAs2 
Availability
Sold
Size
11 x 8 x 1.5 cm - Cabinet 
Tagged
ore mineral , sulfide , nickel  

A large, heavy slab of ore polished on one side. The ores of Cobalt were often slabbed for the geologist to determine the ore characterization such as the texture, how it was mineralized and paragenesis. Rammelsbergite is an ore of nickel and is a nickel arsenide. It is also a member of the Lollingite group. The Rammelsbergite occurs as silvery white anhedral grains to over 1cm. Nickeline, another nickel arsenide, can be seen as brassey or coppery red cores in the Rammelsbergite. Beyond that description, it is impossible to determine visually the phases from one mineral to the other without EDS or microprobe as in the case of the Safflorite, which contains nickel but also cobalt and iron. 


Rammelsbergite

Formula
NiAs2 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Radial, Massive - Granular 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
tin white, reddish white 
Streak
grayish black 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
5.5 
Collection
Robert J. Waidler Collection

Silver

#RW50126
Locality
Lawson mine, Coleman Twp., Cobalt-Gowganda, Ontario, Canada 
Formula
Ag 
Availability
Sold
Size
13.5 x 7 x 2 cm - Cabinet 
Tagged
ore mineral , sulfide , silver  

Veinlets of Silver throughout the specimen. One side is sawed flat and shows good dendritic or arberescent growth through the matrix.


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
Robert J. Waidler Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Silver
On Dakota Matrix
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Silver

#RW50127
Locality
Imiter mine, Anti-Atlas Mts., Dades Region, Morocco 
Formula
Ag 
Availability
Sold
Size
11 x 7 x 2 cm - Cabinet 
Tagged
ore mineral , sulfide , silver  

About 60% of this mass is wire Silver. 


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
Robert J. Waidler 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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