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Recently Released New Additions

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 hydroboracite, and natrobistantite and more from places like Kohnstein quarry, Niedersachswerfen, Harztor, Thuringia, Germany, and Koktokay pegmatite field, Altay, Xinjiang, China.

Hydroboracite - BW58793
Hydroboracite - BW58793

Hydroboracite

#BW58793
Locality
Kohnstein quarry, Niedersachswerfen, Harztor, Thuringia, Germany 
Formula
CaMg[B3O4(OH)3]2·3H2O 
Availability
Available
Price
$40.00
Size
5 x 1.5 x 1 cm - Miniature 

A waterclear crystal.


Hydroboracite

Formula
CaMg[B3O4(OH)3]2·3H2O 
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
2 
Collection
Bill Wilson Collection
Mineralpedia
View Hydroboracite
On Dakota Matrix
Previously Sold Hydroboracite
On Dakota Matrix
Other Available Hydroboracite
WebMineral
View Hydroboracite
Mindat
View Hydroboracite
Natrobistantite - BW58790
Natrobistantite - BW58790

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
On Dakota Matrix
Previously Sold Natrobistantite
On Dakota Matrix
Other Available Natrobistantite
WebMineral
View Natrobistantite
Mindat
View Natrobistantite

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