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Mixed Minerals

Sunday, 28 June 2020 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including cornwallite, elbaite, ferberite, galena, gold, and heulandite and more from places like Cap Garonne mine, Le Pradet, Var, France, Mount Mica quarry, Paris, Oxford Co., Maine, United States, Tungsten mine, Boulder Co., Colorado, United States, Nikolaevskiy mine, Dal'negorsk, Russia, Homestake mine, Lawrence Co., South Dakota, United States, and Teigarhorn, Berufjord, Djúpavogshreppur, Iceland.

Cornwallite

with Olivenite and Azurite - #AH53568
Locality
Cap Garonne mine, Le Pradet, Var, France 
Formula
Cu5(AsO4)2(OH)4 
Availability
Sold
Size
6 x 5.5 x 1.5 cm - Sm Cabinet 
Tagged
arsenate , copper  

Shiny beady green Cornwallite crystals to 4mm with Azurite and Olivenite (acicular). 


Cornwallite

Formula
Cu5(AsO4)2(OH)4 
Crystal System
Monoclinic 
Crystal Habit
Massive, Radial, Encrustations 
Cleavage
None, None, None 
Luster
Earthy (Dull) 
Color
light green, dark green, black green 
Streak
apple green 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
4-5 
Collection
Arnold G Hampson Collection

Elbaite

tourmaline - #AH53588
Locality
Mount Mica quarry, Paris, Oxford Co., Maine, United States 
Formula
Na(Al1.5Li1.5)Al6(BO3)3Si6O18(OH)4 
Availability
Available
Price
$50.00
Size
8 x 5 x 4 cm - Sm Cabinet 
Tagged
pegmatite mineral  

Light to dark green prismatic crystals with some transparency and a prism length of 3 to 20mm. The largest crystal appears to be replaced at the center by fine grained Lepidolite.

Collected by Hampson in 1945.


Elbaite

Formula
Na(Al1.5Li1.5)Al6(BO3)3Si6O18(OH)4 
Crystal System
Trigonal 
Crystal Habit
Striated, Prismatic 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
blue, colorless, green, yellow, white 
Streak
white 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Sub Conchoidal 
Hardness
7.5 
Collection
Arnold G Hampson Collection
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Ferberite

#AH53605
Locality
Tungsten mine, Boulder Co., Colorado, United States 
Formula
Fe2+WO4 
Availability
Available
Price
$65.00
Size
12 x 7 x 5 cm - Cabinet 

Large cabinet specimen of ore-grade black Ferberite with ill-defined crystals in tight clusters. It's a great representation of the ore fro this historic district.


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
Mineralpedia
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Galena

with Quartz - #AH53587
Locality
Nikolaevskiy mine, Dal'negorsk, Russia 
Formula
PbS 
Availability
Available
Price
$35.00
Size
6.5 x 5.5 x 4 cm - Sm Cabinet 
Tagged
sulfide  

Cubic-octahedral Galena crystals to 15mm with needle Quartz.


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 
Collection
Arnold G Hampson Collection
Mineralpedia
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Gold

in Cummingtonite with Pyrrhotite - #53593
Locality
Homestake mine, Lawrence Co., South Dakota, United States 
Formula
Au 
Availability
Sold
Size
8 x 5.5 x 5 cm - Sm Cabinet 
Tagged
native element  

3mm Gold grain in green Cummingtonite schist of the Homestake Formation. This is a great represetation of the ore host, which includes Pyrrhotite, Quartz, and sprays of Cummingtonite.


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 
Mineralpedia
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Heulandite

#AH53616
Locality
Teigarhorn, Berufjord, Djúpavogshreppur, Iceland 
Formula
NaCa4(Si27Al9)O72ยท24H2
Availability
Sold
Size
5.5 x 3.5 x 2 cm - Sm Cabinet 

Hampson went to Iceland to collect zeoloites and he brought back good stock. This piece has pearly white, sharp crystals to 6mm, which were very difficult to photo. 


Heulandite

Collection
Arnold G Hampson Collection

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