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Hampson Colorado Minerals

Sunday, 31 May 2020 06:00 PM

Introducing the "Hampson Colorado Minerals" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including ferberite, galena, gold, greenockite, and guettardite and more from places like Fourth of July mine, Gilpin Co., Colorado, United States, Mountain Springs mine, Rico dist., Dolores Co., Colorado, United States, Bessie G mine, La Plata Co., Colorado, United States, American Tunnel, Silverton, San Juan Co., Colorado, United States, San Juan Vein, Patch mine, Gilpin Co., Colorado, United States, and Brobdignag mine, Red Mtn. dist., San Juan Co., Colorado, United States.

Ferberite

on Quartz - #AH53361
Locality
Fourth of July mine, Gilpin Co., Colorado, United States 
Formula
Fe2+WO4 
Availability
Sold
Size
9 x 7 x 3 cm - Sm Cabinet 

Doesn't look like much of a specimen. You really have to get this under the scope to appreciate it. The Ferberite form euhedral crystals to about 1mm. They are prismatic with rectangular, flat terminations. Most have paralleled crystals on the sides and some are splayed outward, while others are somewhat curved or bent from the center of the prism. All the white is a cover of tiny Quartz crystals.


Ferberite

Formula
Fe2+WO4 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Lamellar, Massive - Granular 
Cleavage
Perfect, Parting, Parting 
Luster
Sub Metallic 
Color
black 
Streak
brownish black 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
4.5 
Collection
Arnold G Hampson Collection
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Galena

#AH53362
Locality
Mountain Springs mine, Rico dist., Dolores Co., Colorado, United States 
Formula
PbS 
Availability
Sold
Size
8.5 x 5.5 x 6 cm - Sm Cabinet 
Tagged
sulfide  

Large specimen of Galena.  The specimen has interesting zones with oriented faces reflecting the light in the same direction. I don't know what causes this, perhaps pressure during formations, perhaps I am just seeing things. 


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 
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Gold

with Coloradoite & Krennerite - #AH53365
Locality
Bessie G mine, La Plata Co., Colorado, United States 
Formula
Au 
Availability
Sold
Size
8 x 8 x 4.5 cm - Sm Cabinet 
Tagged
native element  

Fabulous specimen with a good amount of Gold intimately associated with silvery Coloradoite. Some of the Gold shows wire development. There are three spots which show prismatic crystals of Krennerite. These have slightly different goldish color in the right light, and they also exhibit cleavage. Coloradoite does not have cleavage.


Gold

Formula
Au 
Crystal System
Isometric 
Crystal Habit
Arborescent, Platy, Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
yellow, pale yellow, orange, yellow white, reddish white 
Streak
yellow 
Class
Isometric - Hexoctahedral 
Fracture
Hackly 
Hardness
2.5-3 
Collection
Arnold G Hampson Collection
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Gold

in Quartz - #AH53377
Locality
American Tunnel, Silverton, San Juan Co., Colorado, United States 
Formula
Au 
Availability
Sold
Size
4 x 4 x 3.5 cm - Miniature 
Tagged
native element  

Vein Gold in a 10x8mm area within Quartz with spotty showings across the rest of the specimen with Galena and Sphalerite. Obtained in 1976 by Hampson.

The American Tunnel was dirven in 1959 to intersect the Sunnyside mine orebodies. The tunnel originated at the lower levels of the Gold King mine about a mile away. The complex is located about  seven miles northeat of Silverton at over 12,000ft. It is best known for its Fluorite on Rhodochrosite groups.


Gold

Formula
Au 
Crystal System
Isometric 
Crystal Habit
Arborescent, Platy, Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
yellow, pale yellow, orange, yellow white, reddish white 
Streak
yellow 
Class
Isometric - Hexoctahedral 
Fracture
Hackly 
Hardness
2.5-3 
Collection
Arnold G Hampson Collection
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Greenockite

on Sphalerite - #AH53385
Locality
San Juan Vein, Patch mine, Gilpin Co., Colorado, United States 
Formula
CdS 
Availability
Sold
Size
4.5 x 4.5 x 2.5 cm - Miniature 
Tagged
sulfide  

The more I look at this specimen the more I am impressed. If you are like me and enjoy the studying the paragenesis of the mineralogy, you will thoroughly enjoy this piece. The color of the Greenockite sets it apart from the rest of the minerals. It is a coating on the surface of the Sphalerite crystals which are black and superb to 3mm. In the open spaces, waterclear Quartz formed at the center and along the outer edges of the vein.

There are only a handful of reported Greenockite in Colorado. This specimen carries a Red Mountain Exploration tag.


Greenockite

Formula
CdS 
Crystal System
Hexagonal 
Crystal Habit
Radial, Encrustations, Colloform 
Cleavage
Distinct, Imperfect, None 
Luster
Adamantine - Resinous 
Color
honey yellow, citron yellow, orange yellow 
Streak
orange yellow 
Class
Hexagonal - Dihexagonal Pyramidal 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Arnold G Hampson Collection

Guettardite

#AH53369
Locality
Brobdignag mine, Red Mtn. dist., San Juan Co., Colorado, United States 
Formula
Pb(Sb,As)2S4 
Availability
Sold
Size
9 x 5 x 6 cm - Sm Cabinet 
Tagged
sulfide  

An impressive chunk of this rare sulfosalt. It is massive and has a very strange luster for a metallic mineral. Collected in 1977 by Hampson. The mine is at 14,000ft.


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
Collection
Arnold G Hampson Collection

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