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Rare Minerals Specimens

Sunday, 22 May 2022 02:00 PM

Introducing the "Rare Minerals Specimens" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including alstonite, berryite, braitschite-(ce), callaghanite, covellite, and fluocerite-(ce) and more from places like Minerva #1 mine, Hardin Co., Illinois, United States, Mike mine, San Juan Co., Colorado, United States, Cane Creek, San Juan Co., Utah, United States, Basic Refractories mine, Gabbs, Nye Co., Nevada, United States, Leonard mine, Butte dist., Silver Bow Co., Montana, United States, and Novo Horizonte, Bahia, Brazil.

Alstonite

#BW58511
Locality
Minerva #1 mine, Hardin Co., Illinois, United States 
Formula
BaCa(CO3)2 
Availability
Sold
Size
4 x 3 x 2.5 cm - Miniature 
Tagged
carbonate  

White to colorless pyramidal Alstonite crystals to 1mm in vugs.


Alstonite

Formula
BaCa(CO3)2 
Crystal System
Triclinic 
Crystal Habit
Euhedral Crystals, Pseudo Hexagonal 
Cleavage
Imperfect, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray, white, pink 
Streak
white 
Class
Triclinic 
Fracture
Uneven 
Hardness
4-4.5 
Collection
Bill Wilson Collection
Mineralpedia
View Alstonite
On Dakota Matrix
Previously Sold Alstonite
On Dakota Matrix
Other Available Alstonite
WebMineral
View Alstonite
Mindat
View Alstonite

Berryite

with Aikinite - #BW58097
Locality
Mike mine, San Juan Co., Colorado, United States 
Formula
Cu3Ag2Pb3Bi7S16 
Availability
Sold
Size
4.5 x 4 x 3.5 cm - Miniature 
Tagged
sulfide , copper , silver  

Strands of acicular to filliform Berryite in 1-2mm vugs with iridescent, tarnished, long bladed and striated lengthwise Aikinite to 4mm. There are two good areas of Aikinite. Very good specimen.


Berryite

Formula
Cu3Ag2Pb3Bi7S16 
Crystal System
Monoclinic 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
blue gray, gray 
Class
Monoclinic - Prismatic 
Hardness
3.5 
Collection
Bill Wilson Collection
On Dakota Matrix
Previously Sold Berryite
On Dakota Matrix
Other Available Berryite
WebMineral
View Berryite
Mindat
View Berryite
SOLD
Braitschite-(Ce) - 58502
Braitschite-(Ce) - 58502

Braitschite-(Ce)

#58502
Locality
Cane Creek, San Juan Co., Utah, United States 
Formula
(Ca,Na)7Ce2B24O28(O,OH)12(OH)12·H2
Availability
Sold
Size
5 x 4.5 x 1.5 cm - Miniature 
Tagged
REE mineral  
Special Info
Type & Only Locality 

A pink cluster of Braitschite-(Ce) to 2.5mm. Extremely rare.


Braitschite-(Ce)

Formula
(Ca,Na)7Ce2B24O28(O,OH)12(OH)12·H2
Crystal System
Hexagonal 
Crystal Habit
Microscopic Crystals, Hexagonal, Platy 
Luster
Vitreous (Glassy) 
Color
colorless, white, pink 
Streak
white 
Class
Hexagonal 
Hardness
Collection
Bill Wilson Collection
Special Info
Type & Only Locality

Callaghanite

#58522
Locality
Basic Refractories mine, Gabbs, Nye Co., Nevada, United States 
Formula
Cu2Mg2CO3(OH)6·2H2
Availability
Available
Price
$45.00
Size
3.5 x 3 x 2.5 cm - Miniature 
Tagged
carbonate , copper  
Special Info
Type Locality 

Callaghanite was first found at this locality, thus the type locality. It is a 6 or 7 locality mineral, but is only a copper-magnesium carbonate. The mineral was formed at the contact of diorite with serpentinized dolostone. The color is much like Azurite, an azure-blue. The crystals on this specimen are aggregated so there is not any single good crystals, which are usually quite nice.


Callaghanite

Formula
Cu2Mg2CO3(OH)6·2H2
Crystal System
Monoclinic 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous (Glassy) 
Color
azure, violet blue 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
3-3.5 
Special Info
Type Locality

Covellite

#BW58510
Locality
Leonard mine, Butte dist., Silver Bow Co., Montana, United States 
Formula
CuS 
Availability
Available
Price
$50.00
Size
3 x 3 x 2.5 cm - Thumbnail 
Tagged
copper , sufide  

Blue to purple platy Covellite.


Covellite

Formula
CuS 
Crystal System
Hexagonal 
Crystal Habit
Platy, Foliated 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
indigo blue, light blue, dark blue, black 
Streak
black gray 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Brittle 
Hardness
1.5-2 
Collection
Bill Wilson Collection
Mineralpedia
View Covellite
On Dakota Matrix
Previously Sold Covellite
On Dakota Matrix
Other Available Covellite
WebMineral
View Covellite
Mindat
View Covellite

Fluocerite-(Ce)

ps after Bastnesite - #58471
Locality
Novo Horizonte, Bahia, Brazil 
Formula
CeF3 
Availability
Sold
Size
1.8 x 1.9 x 1.3 cm - Thumbnail 
Tagged
REE mineral  

Excellent replacement of Bastnasite by pink Fluorcerite. The largest crystal is about 1mm. The yellow needles are Rutile and the silvery plate is Hematite. Great specimen.


Fluocerite-(Ce)

Formula
CeF3 
Crystal System
Hexagonal 
Crystal Habit
Massive, Prismatic 
Cleavage
Perfect, None, None 
Luster
Waxy 
Color
pale wax yellow, yellowish brown, reddish brown 
Streak
yellow white 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
4.5-5 

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