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Mixed Minerals

Friday, 15 July 2022 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including helvine, hydroboracite, inesite, microcline, natrobistantite, and tunellite and more from places like near Winston, Sierra Co., New Mexico, United States, Kohnstein quarry, Niedersachswerfen, Harztor, Thuringia, Germany, Hale Creek mine, Trinity Co., California, United States, Crystal Park, El Paso Co., Colorado, United States, Koktokay pegmatite field, Altay, Xinjiang, China, and Pacific Coast Borax Mine, Boron, Kern Co., California.

Helvine

#BW58729
Locality
near Winston, Sierra Co., New Mexico, United States 
Formula
Mn2+4(BeSiO4)3
Availability
Sold
Size
3 x 2.5 x 1.5 cm - Thumbnail 
Tagged
beryllium  

Deep rusty red crystal sections to 3mm.


Helvine

Collection
Bill Wilson Collection
On Dakota Matrix
Previously Sold Helvine
On Dakota Matrix
Other Available Helvine
WebMineral
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Mindat
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Hydroboracite

#BW58793
Locality
Kohnstein quarry, Niedersachswerfen, Harztor, Thuringia, Germany 
Formula
CaMg[B3O4(OH)3]2·3H2
Availability
Available
Price
$40.00
Size
5 x 1.5 x 1 cm - Miniature 

A waterclear crystal.


Hydroboracite

Formula
CaMg[B3O4(OH)3]2·3H2
Crystal System
Monoclinic 
Crystal Habit
Fibrous, Foliated 
Cleavage
Perfect, None, None 
Luster
Vitreous - Silky 
Color
colorless, greenish, white, light brown, wine yellow 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
Collection
Bill Wilson Collection

Inesite

#58559
Locality
Hale Creek mine, Trinity Co., California, United States 
Formula
Ca2Mn2+7Si10O28(OH)2·5H2
Availability
Available
Price
$150.00
Size
7 x 4.5 x 4 cm - Sm Cabinet 

Pink elongated tabular crystals to 2mm lining the many vuggy areas of this specimen. The color is a little less intense.


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
View Inesite
On Dakota Matrix
Previously Sold Inesite
On Dakota Matrix
Other Available Inesite
WebMineral
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Mindat
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Microcline

var. amazonite - #BW58774
Locality
Crystal Park, El Paso Co., Colorado, United States 
Formula
KAlSi3O8 
Availability
Sold
Size
6 x 4 x 2 cm - Sm Cabinet 

A nice bluish green partial crystal.


Microcline

Formula
KAlSi3O8 
Crystal System
Triclinic 
Crystal Habit
Blocky, Crystalline - Coarse, Prismatic 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
bluish green, green, gray, grayish yellow, yellowish 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
Collection
Bill Wilson Collection

Natrobistantite

#BW58790
Locality
Koktokay pegmatite field, Altay, Xinjiang, China 
Availability
Available
Price
$25.00
Size
1.1 x 0.7 x 0.5 cm - Thumbnail 

A few tiny grains less than 1mm in polished probe epoxy. Natrobistantite is discredited bismuth-tantalum-niobium-antimony oxide.


Natrobistantite

Formula
(Na,Cs)Bi(Ta,Nb,Sb)4O12 
Crystal System
Isometric 
Crystal Habit
Aggregates, Octahedral Crystals 
Cleavage
None, None, None 
Luster
Adamantine 
Color
blue green, colorless, green, yellow green 
Streak
white 
Class
Isometric - Hexoctahedral 
Hardness
Collection
Bill Wilson Collection

Tunellite

#BW58801
Locality
Pacific Coast Borax Mine, Boron, Kern Co., California 
Formula
SrB6O9(OH)2·3H2
Availability
Sold
Size
4 x 3 x 1.2 cm - Miniature 

Colorless to gray pearly plates. This is a very good crystal for the species. This mine produced the best Tunellite in the world.


Tunellite

Formula
SrB6O9(OH)2·3H2
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Tabular, Nodular 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous - Pearly 
Color
colorless 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
2.5 
Collection
Bill Wilson Collection
Mineralpedia
View Tunellite
On Dakota Matrix
Previously Sold Tunellite
On Dakota Matrix
Other Available Tunellite
WebMineral
View Tunellite
Mindat
View Tunellite

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