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Mixed Minerals

Friday, 03 May 2019 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including cacoxenite, malachite, and villiaumite and more from places like Gunheath China Clay Pit, St. Austell, Cornwall, England, Cannington, Sedgemoor, Somerset, England, and Mt. Karnasurt, Lovozero Massif, Kola Peninsula, Russia.

Cacoxenite

with Arthurite - #50267
Locality
Gunheath China Clay Pit, St. Austell, Cornwall, England 
Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Availability
Available
Price
$25.00
Size
4.5 x 3.5 x 2 cm - Miniature 
Tagged
phosphate  

Yellow crusts of Cacoxenite with green Arthurite. A good locality specimen.


Cacoxenite

Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Crystal System
Hexagonal 
Crystal Habit
Radial, Acicular, Stellate 
Cleavage
None, None, None 
Luster
Silky 
Color
brownish yellow, green, yellow, golden yellow, red yellow 
Streak
yellow 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 

Malachite

with Azurite - #50401
Locality
Cannington, Sedgemoor, Somerset, England 
Formula
Cu2CO3(OH)2 
Availability
Available
Price
$85.00
Size
8.5 x 6.5 x 4.5 cm - Sm Cabinet 
Tagged
carbonate , copper  

Fascinating "curly" Malachite in vugs with Azurite. The longest Malachite thread is over 1.5cm.


Malachite

Formula
Cu2CO3(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Botryoidal, Stalactitic, Massive - Fibrous 
Cleavage
Perfect, Fair, None 
Luster
Vitreous - Silky 
Color
green, dark green, blackish green 
Streak
light green 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 
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Villiaumite

(graphic intergrowths) in Microcline - #41234
Locality
Mt. Karnasurt, Lovozero Massif, Kola Peninsula, Russia 
Formula
NaF 
Availability
Available
Price
$125.00
Size
8 x 4 x 2 cm - Sm Cabinet 

Villiaumite (red) forms graphic intergrowths showing skeletal and arborescent growth habits in green Microcline. This type of intergrowth has also been termed "elatolith". 


Villiaumite

Formula
NaF 
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Granular 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
colorless, dark red, orange brown, pink 
Streak
pinkish white 
Class
Isometric - Hexoctahedral 
Fracture
Brittle 
Hardness
2.5 

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