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Ore Minerals part 2

Monday, 07 August 2023 03:30 PM

Introducing the "Ore Minerals part 2" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including sphalerite, stibnite, tetrahedrite - tennantite, and uraninite and more from places like Jumbo Shaft (Rico Argentine), Rico Rico dist., Dolores Co., Colorado, United States, McLaughlin mine, Napa Co., California, United States, Crescent mine, Shoshone Co., Idaho, United States, and Ruggles quarry, Grafton Co., New Hampshire, United States.

Sphalerite

#AH62249
Locality
Jumbo Shaft (Rico Argentine), Rico Rico dist., Dolores Co., Colorado, United States 
Formula
ZnS 
Availability
Sold
Size
14 x 8 x 5 cm - Cabinet 
Tagged
ore mineral , sulfide  

Interlocked green 5 to 10mm Sphalerite crystals.


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
Arnold G Hampson Collection

Stibnite

with Realgar - #62251
Locality
McLaughlin mine, Napa Co., California, United States 
Formula
Sb2S3 
Availability
Sold
Size
14 x 16 x 4.5 cm - Cabinet 
Tagged
sulfide , ore specimen  

This specimen is a great study piece just for the mineralogical aspects. At the center are several bands. The thicker bands are in the center and are bounded by very thin millimetric bands. What is very intriguing are the sprays of Stibnite, which shoot up through the Quartz matrix (second photo). These are sprays reach 3cm and the crystals are hair thin. Obviously the crystals formed prior to Quartz solidification and nucleated on the "upper" band. There are also several small 5-6mm cavities which are filled with free-standing Stibnite along the same band, which were never consumed by Quartz.


Stibnite

Formula
Sb2S3 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Striated, Granular 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
lead gray, bluish lead gray, steel gray, black 
Streak
blackish gray 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
Mineralpedia
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Tetrahedrite - Tennantite

(argentiferous) with Siderite - #RW62244
Locality
Crescent mine, Shoshone Co., Idaho, United States 
Formula
Cu12Sb4S13 
Availability
Sold
Size
13 x 8 x 3 cm - Cabinet 
Tagged
sulfide , copper , ore specimen  

Large chunk of silver-bearing Tetrahedrite-Tennantite. The silvery colored and metallic portions are the argentiferous Tetrahedrite-Tennantite with Chalcopyrite and associated brown Siderite.


Collection
Robert J. Waidler Collection

Uraninite

with "gummite" with Zircon - #62253
Locality
Ruggles quarry, Grafton Co., New Hampshire, United States 
Formula
UO2 
Availability
Sold
Size
5 x 4 x 4 cm - Miniature 
Special Info
Radioactive!! 

A typical "gummit" specimen from this classic locality. All the black is Uraninite and the "gummit", which is a catch-all for a variety of secondary uranium minerals. In this case, the orange "gummite" is probably Schoepite with a light yellow unknown. In association with all the uranium minerals are nice crystals of purplish Zircon crystals.


Uraninite

Formula
UO2 
Crystal System
Isometric 
Crystal Habit
Crystalline - Coarse, Botryoidal, Dendritic 
Cleavage
Good, None, None 
Luster
Sub Metallic 
Color
brownish black, gray, grayish black, black 
Streak
brownish black 
Class
Isometric - Hexoctahedral 
Fracture
Brittle - Conchoidal 
Hardness
5-6 
Special Info
Radioactive!!

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