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0 item @ $0.00  

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 gold, gugiaite, hydroboracite, inesite, and natrobistantite and more from places like Harvard mine, Jamestown, Tuolumne Co., California, United States, Dugdu alkaline complex, Tuva, Siberia, Russia, Kohnstein quarry, Niedersachswerfen, Harztor, Thuringia, Germany, Hale Creek mine, Trinity Co., California, United States, and Koktokay pegmatite field, Altay, Xinjiang, China.

Gold

#RG58804
Locality
Harvard mine, Jamestown, Tuolumne Co., California, United States 
Formula
Au 
Availability
Available
Price
$495.00
Size
3.2 x 2.6 x 1.5 cm - Miniature 
Tagged
native element  

An excellent specimen with good eye-appeal. This piece features leaf Gold strung out along 1.5cm in Quartz matrix. The largest leaf is 5mm across.


Gold

Formula
Au 
Crystal System
Isometric 
Crystal Habit
Arborescent, Platy, Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
yellow, pale yellow, orange, yellow white, reddish white 
Streak
yellow 
Class
Isometric - Hexoctahedral 
Fracture
Hackly 
Hardness
2.5-3 
Mineralpedia
View Goldmanite
On Dakota Matrix
Previously Sold Gold
On Dakota Matrix
Other Available Gold
WebMineral
View Gold
Mindat
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Gugiaite

#57774
Locality
Dugdu alkaline complex, Tuva, Siberia, Russia 
Formula
Ca2BeSi2O7 
Availability
Available
Price
$45.00
Size
Capsule 
Special Info
XRD Confirmed 

This is a tiny 1mm specimen with a colorless Gugiaite crystal attached. Gugiaite is a very rare beryllium oxide. Verified by Dr, Igor Pekov.


Gugiaite

Formula
Ca2BeSi2O7 
Crystal System
Tetragonal 
Cleavage
Perfect, Distinct, Indistinct 
Luster
Vitreous (Glassy) 
Color
colorless 
Streak
white 
Class
Tetragonal - Scalenohedral 
Fracture
Uneven 
Hardness
3-4 
Special Info
XRD Confirmed
On Dakota Matrix
Previously Sold Gugiaite
On Dakota Matrix
Other Available Gugiaite
WebMineral
View Gugiaite
Mindat
View Gugiaite

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
View Inesite
Mindat
View Inesite

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

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