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Mixed Minerals

Sunday, 22 August 2021 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including azurite, beryl, colemanite, galena, inesite, and kalsilite and more from places like Tsumeb mine, Tsumeb, Namibia, Gravelotte Emerald mine, Gravelotte, Limpopo, South Africa, Death Valley, Inyo Co., California, United States, Mex-Tex mine, Bingham, Socorro Co., New Mexico, United States, Hale Creek mine, Trinity Co., California, United States, and San Venanzo, Terni Province, Umbria, Italy.

Azurite

with Malachite - #56397
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Cu3(CO3)2(OH)2 
Availability
Available
Price
$50.00
Size
6 x 4 x 4 cm - Sm Cabinet 
Tagged
carbonate , copper  

This simple specimen of Azurite and Malachite is full of vugs hosting numerous micro crystals of Malachite. There are several areas which contain rich blue and lustrous Azurite in 1cm fanned out crystals and acicular replacements of Malachite. There are also several good Cerussite crystals. 


Azurite

Formula
Cu3(CO3)2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Prismatic, Stalactitic 
Cleavage
Perfect, Fair, None 
Luster
Vitreous (Glassy) 
Color
azure blue, blue, light blue, dark blue 
Streak
light blue 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
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Beryl

var. emerald - #56387
Locality
Gravelotte Emerald mine, Gravelotte, Limpopo, South Africa 
Formula
Be3Al2Si6O18 
Availability
Sold
Size
4.5 x 2 x 1.5 cm - Miniature 
Tagged
beryllium  

Schist matrix specimen hosting rich faint green to deep green, gemmy emerald crystals to 1cm.


Beryl

Formula
Be3Al2Si6O18 
Crystal System
Hexagonal 
Crystal Habit
Crystalline - Coarse, Prismatic, Columnar 
Cleavage
Imperfect, None, None 
Luster
Vitreous - Resinous 
Color
green, blue, yellow, colorless, pink 
Streak
white 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
7.5-8 
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Colemanite

#WR56315
Locality
Death Valley, Inyo Co., California, United States 
Formula
CaB3O4(OH)3·H2
Availability
Sold
Size
5 x 4 x 3.5 cm - Miniature 
Special Info
Fluorescent 

This is one of the better Colemanites specimens that I have seen. I say this because the piece as nothing but undamaged, sharply pointed small and large crystals (1cm plus) all grown to perfection.


Colemanite

Formula
CaB3O4(OH)3·H2
Crystal System
Monoclinic 
Crystal Habit
Blocky, Crystalline - Coarse, Massive - Granular 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray, gray white, yellowish white, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
4.5 
Collection
Willard L. Roberts Collection
Special Info
Fluorescent

Galena

#AH56395
Locality
Mex-Tex mine, Bingham, Socorro Co., New Mexico, United States 
Formula
PbS 
Availability
Available
Price
$35.00
Size
3.5 x 2.5 x 3.5 cm - Miniature 
Tagged
sulfide  

Handsome specimen of a trio of cubic Galena crystals with a dull coating of Anglesite (thank Bob W.) associated with a little Fluorite.


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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Inesite

#56393
Locality
Hale Creek mine, Trinity Co., California, United States 
Formula
Ca2Mn2+7Si10O28(OH)2·5H2
Availability
Sold
Size
5 x 3.5 x 3 cm - Miniature 

Hale Creek is definitly one of the best Inesite deposits in the World. Two other Inesite deposits are Wessles (S. Africa) and Fengjiashan (China). These crystals measure up to be around 1cm. It is a fine specimen with good sharp crystals with a nice pink color.


Inesite

Formula
Ca2Mn2+7Si10O28(OH)2·5H2
Crystal System
Triclinic 
Crystal Habit
Radial, Massive - Fibrous, Spherical 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
brown, brown, pink, orange 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle - Uneven 
Hardness
Mineralpedia
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Kalsilite

#56308
Locality
San Venanzo, Terni Province, Umbria, Italy 
Formula
KAlSiO4 
Availability
Available
Price
$25.00
Size
5 x 4 x 3.5 cm - Miniature 

Kalsilite, a feldspathoid, which occurs in silica deficient rocks, occurs as fine, acicular crystals to about 1mm in the many voids of this specimen.

 


Kalsilite

Formula
KAlSiO4 
Crystal System
Trigonal 
Cleavage
Indistinct, Indistinct, None 
Luster
Vitreous - Greasy 
Color
colorless, gray, gray white, white 
Streak
white 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
Mineralpedia
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On Dakota Matrix
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