mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

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.

Silver

Allargentum, Nickeline and Breithauptite - #PD30644
Locality
Deer Horn mine, Cobalt dist., Ontario, Canada 
Formula
Ag 
Availability
Sold
Size
7 x 4 x 1.5 cm - Sm Cabinet 
Tagged
Ore Minerals  

Cobalt district ores occur in distinct mineral assemblages as outlined by William Petruk in the 1971 publication "The Silver-Arsenides of the Cobalt-Gowganda Region, Ontario". This specimen fits well in group 2 of Petruk's which contain high Silver and Allargentum. It is sawed and polished on one side. The Silver is easily seen in matrix as well as the brassy luster of the Nickeline and Breithauptite.


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

Skutterudite

Silver and Stephanite - #PD30615
Locality
Silverfields mine, Cobalt dist., Ontario, Canada 
Formula
CoAs3-x 
Availability
Sold
Size
6 x 3.5 x 3 cm - Sm Cabinet 
Tagged
Ore Minerals  

Of all the Cobalt specimens in this Special Edition this one exemplifies the nature of the Cobalt style mineralization. Cobalt, a large Silver deposit had significant native Silver zones. Some of the veins were so large they termed one of them the "Silver Sidewalk". This specimen shows native Silver throughout the matrix with Stephanite and silvery Skutterrudite. Other possible associates include Stromeyerite and Chalcocite. This specimen and the other ore slabs in this Special Edition are most likely from the large research project performed on this deposit in the 1960's.


Skutterudite

Formula
CoAs3-x 
Crystal System
Isometric 
Crystal Habit
Granular, Colloform, Massive 
Cleavage
Distinct, Distinct, None 
Luster
Metallic 
Color
white, light steel gray 
Streak
black 
Class
Isometric - Diploidal 
Fracture
Brittle 
Hardness
5.5-6 
Collection
Phillips Collection

Sphalerite

#PD30637
Locality
W. Fork Mine, Reynolds Co., Missouri, United States 
Formula
ZnS 
Availability
Sold
Size
8.5 x 5 x 6 cm - Sm Cabinet 
Tagged
Ore Minerals  

Dark lustrous brown Sphalerite crystals to 3mm totally covering lumpy colloform growths of brassy Pyrite. Neat specimen!
The W. Fork Mine is located in the SE lead-district in Missouri and is also a Mississippi Valley Type deposit in the Viburnum Trend. According to a paper on the W. Fork Mine the presence of rapidly deposited, collorform ZnS and FeS is an indicator that the ore fluids which deposited the sulfides in the central zone were more saturated with respect to metal sulfides (email us for link to abstract if interested).


Sphalerite

Formula
ZnS 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Granular, Colloform 
Cleavage
Perfect, Perfect, Perfect 
Luster
Resinous - Greasy 
Color
brown, yellow, red, green, black 
Streak
brownish white 
Class
Isometric - Hextetrahedral 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Phillips Collection

Terlinguaite

#PD30646
Locality
Terlingua dist., Brewster Co., Texas, United States 
Formula
Hg2OCl 
Availability
Sold
Size
7 x 5 x 2.5 cm - Sm Cabinet 
Tagged
Ore Minerals  

Mercury has not been mined in the USA since 1992 when the McDermitt mine in Nevada closed. It is now only produced as a by-product from gold-silver mines. Nonetheless, the USA is the leading exporter of mercury since it is still produced through secondary recovery programs and recycling. A 76 pound mercury "flask" averaged $550-650 in 2008 (USGS). At one time the USA had many mines namely in California. Terlingua, Texas had producing mercury mines. Terlinguaite, like this specimen, was a chief ore at Terlingua. This is an old Carleton Davis specimen with tag.


Terlinguaite

Formula
Hg2OCl 
Crystal System
Monoclinic 
Crystal Habit
Striated, Prismatic 
Cleavage
Perfect, None, None 
Luster
Adamantine 
Color
yellow, greenish yellow, brown, olive green 
Streak
light yellow 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
2-3 
Collection
Phillips Collection

Todorokite

#PD30628
Locality
Sierra Maestra, Oriente Province, Cuba 
Formula
(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12·3-4H2
Availability
Sold
Size
6.5 x 4 x 7 cm - Sm Cabinet 
Tagged
Ore Minerals  

Large piece of black-brown compact Todorokite in plumose patterns with an old Ward's label that says this specimen is from the pre Castro days, which would be before approx. 1959.
We found an old 1944 USGS publication on the deposits of the Oriente Province online (email us for link if interested) with some facts about the Manganese mining in Cuba. In this paper it mentions that in 1941 the Sierra Maestra Mn district produced 75,000 to 90,000 tons of ore with 40% or more Mn and total known reserves estimated at 300,000 tons with 40% Mn.


Todorokite

Formula
(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12·3-4H2
Crystal System
Monoclinic 
Crystal Habit
Nodular, Reniform, Aggregates 
Cleavage
Perfect, Perfect, None 
Luster
Metallic - Dull 
Color
brownish black, gray, grayish black, dark brown, black 
Streak
dark brown 
Class
Monoclinic - Prismatic 
Hardness
1.5 
Collection
Phillips Collection

Ulexite

Colemanite - #PD30652
Locality
Boron, Kern Co., California, United States 
Formula
NaCaB5O6(OH)6·5H2
Availability
Sold
Size
10 x 6 x 6 cm - Cabinet 
Tagged
Ore Minerals  

An excellent specimen showing the fibrous nature of Ulexite used in fiber optics. Also called "TV rock" Ulexite as the remarkable property of transferring light through its fibers by the refraction of light even when bent.


Ulexite

Formula
NaCaB5O6(OH)6·5H2
Crystal System
Triclinic 
Crystal Habit
Acicular, Fibrous, Capillary 
Cleavage
Perfect, Perfect, None 
Luster
Chatoyant 
Color
colorless, white 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle 
Hardness
2.5 
Collection
Phillips Collection
Mineralpedia
View Ulexite
On Dakota Matrix
Previously Sold Ulexite
On Dakota Matrix
Other Available Ulexite
WebMineral
View Ulexite
Mindat
View Ulexite

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2014 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map