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Mixed Minerals

Friday, 03 April 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 aragonite, cassiterite, copper, jamesonite, plattnerite, and quartz and more from places like Florence mine, Egremont, Cumbria, England, St. Just United mine, St. Just, Cornwall, England, Dzhezkazgan mine, Karagandy, Kazakhstan, Wheal Boys, Port Isaac, St. Endellion, Cornwall, England, Mina Ojuela, Mapimi, Durango, Mexico, and Granite quarry, Carroll Co., New Hampshire, United States.

Aragonite

on Hematite - #52443
Locality
Florence mine, Egremont, Cumbria, England 
Formula
CaCO3 
Availability
Available
Price
$40.00
Size
5.5 x 3.5 x 6.5 cm - Sm Cabinet 
Tagged
carbonate  

White balls of Aragonite to 5mm on Hematite with glassy bluish Quartz.


Aragonite

Formula
CaCO3 
Crystal System
Orthorhombic 
Crystal Habit
Pseudo Hexagonal, Columnar, Fibrous 
Cleavage
Distinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, white, gray, yellowish white, reddish white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Sub Conchoidal 
Hardness
3.5-4 
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Cassiterite

#52437
Locality
St. Just United mine, St. Just, Cornwall, England 
Formula
SnO2 
Availability
Available
Price
$35.00
Size
4.5 x 4.5 x 4 cm - Miniature 
Tagged
tin  

Solid chunk of Cassiterite one of the more famous and historic tin mines in the world. There are numerous, greasy brown, prismatic crystals to about 1-2mm of which I could not obtain suitable photos of...


Cassiterite

Formula
SnO2 
Crystal System
Tetragonal 
Crystal Habit
Prismatic, Massive, Botryoidal 
Cleavage
Perfect, Indistinct, None 
Luster
Adamantine 
Color
brown, brownish black, colorless, green, gray 
Streak
brownish white 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Irregular 
Hardness
6-7 

Copper

#AH52972
Locality
Dzhezkazgan mine, Karagandy, Kazakhstan 
Formula
Cu 
Availability
Available
Price
$50.00
Size
8 x 4 x 3 cm - Sm Cabinet 
Tagged
copper  

Copper vein fillings.


Copper

Formula
Cu 
Crystal System
Isometric 
Crystal Habit
Nodular, Arborescent 
Cleavage
None, None, None 
Luster
Metallic 
Color
brown, copper red, light pink, red 
Streak
rose 
Class
Isometric - Hexoctahedral 
Fracture
Hackly 
Hardness
2.5-3 
Collection
Arnold G Hampson Collection
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Jamesonite

in Quartz - #52477
Locality
Wheal Boys, Port Isaac, St. Endellion, Cornwall, England 
Formula
Pb4FeSb6S14 
Availability
Available
Price
$75.00
Size
12 x 8 x 4 cm - Cabinet 
Tagged
sulfide  

A large specimen rich in silvery, fibrous Jamesonite in Quartz.


Jamesonite

Formula
Pb4FeSb6S14 
Crystal System
Monoclinic 
Crystal Habit
Acicular, Radial, Massive - Fibrous 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
lead gray, steel gray, dark lead gray 
Streak
black. grayish 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
2.5 

Plattnerite

with Mimetite - #AH52951
Locality
Mina Ojuela, Mapimi, Durango, Mexico 
Formula
PbO2 
Availability
Available
Price
$225.00
Size
11.5 x 7.5 x 4 cm - Cabinet 

A very colorful beautiful specimen with some of the best and largest Plattnerite crystals that I have seen. The Plattnerite crystals are still tiny but are excellent and stand-out under the scope. They also top the yellow Mimetite in places. The Mimetite itself is  lemon yellow and forms little bow-ties to nearly 5mm.Both of these minerals are grown on a 2mm layer of Hemimorphite.


Plattnerite

Formula
PbO2 
Crystal System
Tetragonal 
Crystal Habit
Massive, Encrustations, needle-like millimeter size crystals 
Cleavage
None, None, None 
Luster
Sub Metallic 
Color
brownish black, iron black, black 
Streak
chestnut brown 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Brittle 
Hardness
5.5 
Collection
Arnold G Hampson Collection

Quartz

var. smoky with Microcline - #AH52953
Locality
Granite quarry, Carroll Co., New Hampshire, United States 
Formula
SiO2 
Availability
Available
Price
$30.00
Size
7 x 4 x 3.5 cm - Sm Cabinet 

Nice pink Microcline crystals to 1cm amongst dark smoky Quartz to 2cm. It is interesting to see the graphic granite on the underneath which later "blossomed" into the crystals.


Quartz

Formula
SiO2 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Druse, Crystalline - Fine 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
brown, colorless, violet, gray, yellow 
Streak
white 
Class
Trigonal - Trapezohedral 
Fracture
Conchoidal 
Hardness
Collection
Arnold G Hampson Collection
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