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Rare Minerals

Saturday, 16 October 2021 06:00 PM

Introducing the "Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including adamite, baryte, cerchiaraite-(fe), dickite, fencooperite, and fluorapatite and more from places like Mina Ojuela, Mapimi, Durango, Mexico, Cumberland, England, Esquire #8 claim, Big Creek, Fresno Co., California, United States, Bessie G mine, La Plata Co., Colorado, United States, Trumbull Peak, Mariposa Co., California, United States, and Cerro de Mercado mine, Durango, Mexico.

Adamite

#50849
Locality
Mina Ojuela, Mapimi, Durango, Mexico 
Formula
Zn2AsO4(OH) 
Availability
Available
Price
$35.00
Size
6 x 4.5 x 2 cm - Sm Cabinet 
Tagged
arsenate  

An interesting specimen of yellow Adamite color zoned with purple manganoan Adamite at the termination of each crystal. Look closely at the crystals, there are single prisms and fans.


Adamite

Formula
Zn2AsO4(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Druse, Encrustations 
Cleavage
One Good 
Luster
Vitreous - Resinous 
Color
yellow, green, violet, pink, yellowish green 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
3.5 
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Previously Sold Adamite
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Baryte

#53346
Locality
Cumberland, England 
Formula
BaSO4 
Availability
Available
Price
$350.00
Size
8.5 x 3 x 1.5 cm - Sm Cabinet 

A thick bladed, translucent brown, color zoned Baryte crystal from this oldtime-classic locality. For how old the specimen must be, with an old Gregory, Bottley & Co. label, it is in good shape. The termination is sharp but with a tiny ding. There are other scuff marks, but in general most of the imperfections are internal and not man made. The prim sides have a sawtooth-like habit. Overall a great specimen.


Baryte

Formula
BaSO4 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Prismatic, Massive - Fibrous 
Cleavage
Perfect, Perfect, Imperfect 
Luster
Vitreous (Glassy) 
Color
white, yellowish white, grayish white, brownish white, dark brown 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
Collection
Willard L. Roberts Collection
Mineralpedia
View Baryte
On Dakota Matrix
Previously Sold Baryte
On Dakota Matrix
Other Available Baryte
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Mindat
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SOLD
Cerchiaraite-(Fe) - 56635
Cerchiaraite-(Fe) - 56635

Cerchiaraite-(Fe)

#56635
Locality
Esquire #8 claim, Big Creek, Fresno Co., California, United States 
Formula
Ba4Fe43+O3(OH)3(Si4O12)[Si2O3(OH)4]Cl 
Availability
Sold
Size
1.7 x 1 x 0.7 cm - Thumbnail 
Special Info
Type Locality 

Cerchiaraite-(Fe) forms by the alteration of sanbornite-quartz rock and occurs as dark blue micro prisms in matrix barely visible with microscope. The crystals may be associated with Bazirite, Calcite. Cerchiaraite-(Fe) shares type localities with the Cerchiara mine and Esquire #7 claim. 


Cerchiaraite-(Fe)

Special Info
Type Locality

Dickite

#AH56713
Locality
Bessie G mine, La Plata Co., Colorado, United States 
Formula
Al2Si2O5(OH)4 
Availability
Sold
Size
8 x 4 x 2 cm - Sm Cabinet 

White, glittery, masses of Dickite on ore.


Dickite

Formula
Al2Si2O5(OH)4 
Crystal System
Monoclinic 
Crystal Habit
Earthy 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
blue, colorless, gray, yellow brown, white 
Streak
white 
Class
Monoclinic - Domatic 
Fracture
Earthy 
Hardness
1.5-2 
Collection
Arnold G Hampson Collection
Mineralpedia
View Dickite
On Dakota Matrix
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Fencooperite - 56653
Fencooperite - 56653

Fencooperite

with Gillespite - #56653
Locality
Trumbull Peak, Mariposa Co., California, United States 
Formula
Ba6Fe3+3Si8O23(CO3)2Cl3·H2
Availability
Sold
Size
1.3 x 1 x 0.7 cm - Thumbnail 
Special Info
Type Locality 

Isolated black grains about to 1mm with a much smaller grain with Gillespite in Sanbornite matrix. 


Fencooperite

Formula
Ba6Fe3+3Si8O23(CO3)2Cl3·H2
Crystal System
Trigonal 
Crystal Habit
Aggregates, Anhedral Grains, Platy 
Luster
Vitreous - Adamantine 
Color
jet black, dirty gray brown 
Streak
grayish black 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Conchoidal - Uneven 
Hardness
4.5-5 
Special Info
Type Locality

Fluorapatite

#AH54163
Locality
Cerro de Mercado mine, Durango, Mexico 
Formula
Ca5(PO4)3
Availability
Sold
Size
2.2 x 1.3 x 1 cm - Thumbnail 
Tagged
phosphate  

A wonderful yellow prismatic and gemmy Fluorapatite single crystal to 2.2cm with a pyramidal termination. 


Fluorapatite

Formula
Ca5(PO4)3
Crystal System
Hexagonal 
Crystal Habit
Massive - Granular, Euhedral Crystals 
Cleavage
Indistinct, None, None 
Luster
Vitreous - Resinous 
Color
blue, brown, colorless, violet, green 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness

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