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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, epidote, goethite, malachite, millerite, and villiaumite and more from places like Gunheath China Clay Pit, St. Austell, Cornwall, England, Hawthorne, Mineral Co., Nevada, United States, Whiteside mine, Mesabi Range, St. Louis Co., Minnesota, United States, Cannington, Sedgemoor, Somerset, England, Coed-Ely Colliery, Coed Ely, Rhondda-Cynon-Taff, Wales, 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 

Epidote

#46236
Locality
Hawthorne, Mineral Co., Nevada, United States 
Formula
Ca2Fe3+Al2(Si2O7)(SiO4)O(OH) 
Availability
Available
Price
$75.00
Size
5 x 1.5 x 1 cm - Miniature 

Dark green prismatic and terminated single crystal. Excellent specimen.


Epidote

Formula
Ca2Fe3+Al2(Si2O7)(SiO4)O(OH) 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Fibrous, Massive 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
yellowish green, brownish green, black, yellow, gray 
Streak
grayish white 
Class
Monoclinic - Prismatic 
Fracture
Regular 
Hardness
Collection
Chris van Laer Collection
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Goethite

#50677
Locality
Whiteside mine, Mesabi Range, St. Louis Co., Minnesota, United States 
Formula
FeO(OH) 
Availability
Available
Price
$35.00
Size
5.5 x 3 x 3 cm - Sm Cabinet 

Botryoidal Goethite with nice cross-sections showing crystal habits. Collected in 1960 as the label shows (see prov.)


Goethite

Formula
FeO(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Acicular, Reniform, Radial 
Cleavage
Perfect, Distinct, None 
Luster
Adamantine - Silky 
Color
brown, reddish brown, yellowish brown, brownish yellow, ocher yellow 
Streak
yellowish brown 
Class
Orthorhombic - Dipyramidal 
Fracture
Hackly 
Hardness
5-5.5 
Mineralpedia
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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 
Mineralpedia
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Millerite

#50400
Locality
Coed-Ely Colliery, Coed Ely, Rhondda-Cynon-Taff, Wales 
Formula
NiS 
Availability
Available
Price
$125.00
Size
11.5 x 6 x 7 cm - Cabinet 
Tagged
sulfide , nickel  

Quite possibly this spray has been altered to Honessite. The spray is 1cm.


Millerite

Formula
NiS 
Crystal System
Trigonal 
Crystal Habit
Acicular, Massive 
Cleavage
Perfect, Perfect, None 
Luster
Metallic 
Color
bronze, greenish gray, gray, brass yellow 
Streak
greenish black 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Uneven 
Hardness
3-3.5 
Mineralpedia
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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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