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Rare Mineral Species

Friday, 09 August 2019 06:30 PM

Introducing the "Rare Mineral Species" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including clinobarylite, cobaltarthurite, columbite-(fe), elbaite, emmonsite, and galena and more from places like Hackmann Valley, Yukspor Mt, Khibiny Massif, Kola Peninsula, Russia, Dolores prospect, Pastrana, Mazarrón-Águilas, Murcia, Spain, Lubilokwi, Maniema, Democratic Republic of Congo, Minas Gerais, Brazil, Bambolla mine, Moctezuma, Sonora, Mexico, and Camp Bird mine, Ouray Co., Colorado, United States.

Clinobarylite

#50469
Locality
Hackmann Valley, Yukspor Mt, Khibiny Massif, Kola Peninsula, Russia 
Formula
BaBe2Si2O7 
Availability
Sold
Size
3.3 x 2.2 x 1.1 cm - Miniature 
Tagged
beryllium  
Special Info
Type Locality 

White platy crystals to 1mm in a 5x2mm area. Barylite is a very rare beryllium mineral found in only two occurences worldwide, both in the Khibiny Massif. Identified by Dr. Igor Pekov.


Clinobarylite

Formula
BaBe2Si2O7 
Crystal System
Orthorhombic 
Crystal Habit
Radial, Aggregates, Platy 
Cleavage
Perfect, Very Good, Very Good 
Luster
Vitreous (Glassy) 
Color
colorless 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
6.5 
Special Info
Type Locality
SOLD
Cobaltarthurite - 51102
Cobaltarthurite - 51102

Cobaltarthurite

#51102
Locality
Dolores prospect, Pastrana, Mazarrón-Águilas, Murcia, Spain 
Formula
CoFe+32(AsO4)2(OH)2·4H2
Availability
Sold
Size
3.5 x 2 x 1 cm - Miniature 
Tagged
arsenate  
Special Info
Type Locality 
Special Info
Author's Material 

Dark brownish red fuzzy balls. It was acquired from author J. Vinals material to describe the species.


Cobaltarthurite

Formula
CoFe+32(AsO4)2(OH)2·4H2
Crystal System
Monoclinic 
Crystal Habit
Globular, Oolitic, Massive 
Cleavage
None, None, None 
Luster
Vitreous - Silky 
Color
straw yellow, dark brown 
Streak
light brownish white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
3.5-4 
Special Info
Type Locality
Special Info
Author's Material

Columbite-(Fe)

#50424
Locality
Lubilokwi, Maniema, Democratic Republic of Congo 
Formula
Fe2+Nb2O6 
Availability
Sold
Size
2.1 x 2.4 x 0.6 cm - Thumbnail 

Single, tabular crystal with two good faces and beveled terminations.


Columbite-(Fe)

Formula
Fe2+Nb2O6 
Crystal System
Orthorhombic 
Crystal Habit
Massive - Granular, Striated 
Cleavage
Distinct, None, None 
Luster
Sub Metallic 
Color
black, brownish black 
Streak
blackish brown 
Class
Orthorhombic - Dipyramidal 
Fracture
Sub Conchoidal 
Hardness

Elbaite

tourmaline - #51088
Locality
Minas Gerais, Brazil 
Formula
Na(Al1.5Li1.5)Al6(BO3)3Si6O18(OH)4 
Availability
Sold
Size
10 x 8 x 9 cm - Cabinet 
Tagged
pegmatite mineral  

This specimen is much more impressive in-hand. It is basically a large pocket of 1-3cm green Elbaite lining a pocket between cleavelandite blades.


Elbaite

Formula
Na(Al1.5Li1.5)Al6(BO3)3Si6O18(OH)4 
Crystal System
Trigonal 
Crystal Habit
Striated, Prismatic 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
blue, colorless, green, yellow, white 
Streak
white 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Sub Conchoidal 
Hardness
7.5 
Collection
Dr. Buford Nichols Collection
Mineralpedia
View Elbaite
On Dakota Matrix
Previously Sold Elbaite
On Dakota Matrix
Other Available Elbaite
WebMineral
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Mindat
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SOLD
Emmonsite - 51092
Emmonsite - 51092

Emmonsite

#51092
Locality
Bambolla mine, Moctezuma, Sonora, Mexico 
Formula
Fe3+2(Te4+O3)3·2H2
Availability
Sold
Size
5 x 2.5 x 4 cm - Miniature 
Tagged
tellurium  

Green crystallized crusts.


Emmonsite

Formula
Fe3+2(Te4+O3)3·2H2
Crystal System
Triclinic 
Crystal Habit
Mammillary 
Cleavage
Perfect, None, None 
Luster
Vitreous - Dull 
Color
yellow, greenish yellow 
Class
Triclinic - Pinacoidal 
Hardness
2-2.5 
Mineralpedia
View Emmonsite
On Dakota Matrix
Previously Sold Emmonsite
On Dakota Matrix
Other Available Emmonsite
WebMineral
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Mindat
View Emmonsite

Galena

with Chalcopyrite - #51111
Locality
Camp Bird mine, Ouray Co., Colorado, United States 
Formula
PbS 
Availability
Sold
Size
13 x 10 x 2 cm - Cabinet 
Tagged
sulfide  

This is a plate of ore from this historic Colorado mine showing plenty of Galena and Chalcopyrite in breccia.


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 
Mineralpedia
View Galena
On Dakota Matrix
Previously Sold Galena
On Dakota Matrix
Other Available Galena
WebMineral
View Galena
Mindat
View Galena

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