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Rare & Mixed Minerals

Monday, 08 August 2022 06:00 PM

Introducing the "Rare & Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including beryl, hydrohetaerolite, mimetite, tacharanite, and taramite and more from places like Bennett quarry, Buckfield, Oxford Co., Maine, United States, Wolftone mine, Leadville, Lake Co., Colorado, Tsumeb mine, Tsumeb, Namibia, Road cut, Doe Hill, Highland Co., Virginia, United States, and Itinga, Minas Gerais, Brazil.

Beryl

var. cesium - #BW59009
Locality
Bennett quarry, Buckfield, Oxford Co., Maine, United States 
Formula
Be3Al2Si6O18 
Availability
Available
Price
$35.00
Size
4 x 4.5 x 1.3 cm - Miniature 
Tagged
beryllium  

Pink cesium bearing Beryl mass.


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 
Collection
Bill Wilson Collection
Mineralpedia
View Beryl
On Dakota Matrix
Previously Sold Beryl
On Dakota Matrix
Other Available Beryl
WebMineral
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Mindat
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Hydrohetaerolite

#RS59008
Locality
Wolftone mine, Leadville, Lake Co., Colorado 
Formula
Zn2Mn3+4O8·H2
Availability
Available
Price
$30.00
Size
6 x 5.5 x 3.5 cm - Sm Cabinet 

Black crystalline masses sparse in matrix. It is a locality specimn.


Hydrohetaerolite

Formula
Zn2Mn3+4O8·H2
Crystal System
Tetragonal 
Crystal Habit
Radial, Botryoidal, Massive 
Cleavage
Good, None, None 
Luster
Sub Metallic 
Color
brownish black, dark brown 
Streak
dark brown 
Class
Tetragonal - Ditetragonal Dipyramidal 
Hardness
5-6 
Collection
RC Stamberg Collection

Mimetite

with Duftite(?) - #RS58928
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Pb5(AsO4)3Cl 
Availability
Available
Price
$75.00
Size
5 x 4 x 2 cm - Miniature 
Tagged
arsenate  

A colorful Mimetite specimen with a red coating on half of the crystals and the remainder being your typical yellow. Many of the crystals show an incredible six-sided pyramidal termination. Hidden near the top edge of the specimen are granular Duftite(?) crystals. The Duftite is barely seen in hand not because of the size, but because of the color. The digital camera enhances the green.


Mimetite

Formula
Pb5(AsO4)3Cl 
Crystal System
Hexagonal 
Crystal Habit
Reniform, Globular, Prismatic 
Cleavage
Imperfect, None, None 
Luster
Adamantine - Resinous 
Color
white, yellow, orange, brown, red 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
Collection
RC Stamberg Collection
Mineralpedia
View Mimetite
On Dakota Matrix
Previously Sold Mimetite
On Dakota Matrix
Other Available Mimetite
WebMineral
View Mimetite
Mindat
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Tacharanite

#BW58960
Locality
Road cut, Doe Hill, Highland Co., Virginia, United States 
Formula
Ca12Al2Si18O33(OH)36 
Availability
Available
Price
$45.00
Size
5 x 5 x 2.5 cm - Miniature 

Snow white spheroidal crystal groups occupying amygdules in basalt matrix. Tacharanite is a phyllosilicate, not a zeolite.


Tacharanite

Formula
Ca12Al2Si18O33(OH)36 
Crystal System
Monoclinic 
Crystal Habit
Cryptocrystalline 
Luster
Earthy (Dull) 
Color
white 
Streak
white 
Class
Monoclinic 
Fracture
Conchoidal 
Hardness
Collection
Bill Wilson Collection

Taramite

#BW58958
Locality
Itinga, Minas Gerais, Brazil 
Formula
Na2CaFe2+3AlFe3+(Si6Al2)O22(OH)2 
Availability
Available
Price
$125.00
Size
5.5 x 2.5 x 1.3 cm - Sm Cabinet 

Taramite is a rare member of the amphibole group found at only a handful of localities. This specimen shows 1 to 3cm long green crystals in a nice divergent group.


Taramite

Formula
Na2CaFe2+3AlFe3+(Si6Al2)O22(OH)2 
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
blue green, black 
Streak
greenish gray 
Class
Monoclinic - Prismatic 
Hardness
5-6 
Collection
Bill Wilson Collection
On Dakota Matrix
Previously Sold Taramite
On Dakota Matrix
Other Available Taramite
WebMineral
View Taramite
Mindat
View Taramite

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