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Mixed Minerals

Friday, 10 September 2021 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including baryte, barytocalcite, chrysotile, descloizite, and duftite and more from places like San Francisco mine, Sonora, Mexico, Admiralty Flaty, Alston Moor, Cumbria, England, Camp Verde, Yavapai Co., Arizona, United States, Easton Talc quarry, Northampton Co., Pennsylvania, United States, Berg Aukus, Grootfontein dist., Namibia, and Tsumeb mine, Tsumeb, Namibia.

Baryte

with Wulfenite - #BC52689
Locality
San Francisco mine, Sonora, Mexico 
Formula
BaSO4 
Availability
Sold
Size
6.5 x 4.5 x 4 cm - Sm Cabinet 

You generally do not see much of the Baryte from this mine. These groups are 2cm across and are light or faint blue in color. They are perched nicely on a Wulfenite and Mimetite matrix.


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
Barbara Cureton Collection
Mineralpedia
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Previously Sold Baryte
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Other Available Baryte
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Barytocalcite

with Calcite - #BC52695
Locality
Admiralty Flaty, Alston Moor, Cumbria, England 
Formula
BaCa(CO3)2 
Availability
Sold
Size
14 x 10 x 5 cm - Cabinet 
Tagged
carbonate  

This is a large cabinet specimen with numerous, distinct, light pink rosettes of Barytocalcite to 3cm. The Calcite crystals are much smaller on the order of 3-5mm and form rhombic staked plates. The specimen is out of the Barbara Cureton mineral collection and the index card states that is was once in the Lyman Mineral Museum collection and was acquired in 1998. This is the type locality.


Barytocalcite

Formula
BaCa(CO3)2 
Crystal System
Monoclinic 
Crystal Habit
Druse, Massive - Granular, Prismatic 
Cleavage
Perfect, Perfect, Distinct 
Luster
Vitreous - Resinous 
Color
white, yellow, gray, greenish gray 
Streak
white 
Class
Monoclinic - Sphenoidal 
Fracture
Sub Conchoidal 
Hardness

Calcite

ps after Glauberite - #AH56462
Locality
Camp Verde, Yavapai Co., Arizona, United States 
Formula
CaCO3 
Availability
Available
Price
$175.00
Size
10 x 6 x 6 cm - Cabinet 
Tagged
carbonate  

Calcite pseudomorph after Glauberite with sharp, excellent, crystals with some of the best preserved forms I have seen of these specimens. Usually these are broken or scuffed up, but not this specimen. It is nearly perfect with no damage at all. It was purchased by Hampson in 1967.


Calcite

Formula
CaCO3 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Stalactitic, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
colorless, white, pink, yellow, brown 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Arnold G Hampson Collection
Mineralpedia
View Calcite
On Dakota Matrix
Previously Sold Calcite
On Dakota Matrix
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Mindat
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Chrysotile

in serpentine - #AH56449
Locality
Easton Talc quarry, Northampton Co., Pennsylvania, United States 
Formula
Mg3Si2O5(OH)4 
Availability
Sold
Size
6 x 5 x 3 cm - Sm Cabinet 

This is just a good example Chrysotile (asbestos) sandwiched in serpentine. Each "vein" is about 3mm wide and shows the typical fibrous nature of the Chrysotile. 


Chrysotile

Formula
Mg3Si2O5(OH)4 
Crystal System
Monoclinic 
Crystal Habit
Acicular 
Luster
Silky 
Color
green 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
2.5 
Collection
Arnold G Hampson Collection

Descloizite

#AH56463
Locality
Berg Aukus, Grootfontein dist., Namibia 
Formula
PbZnVO4(OH) 
Availability
Available
Price
$95.00
Size
7 x 6 x 7.5 cm - Sm Cabinet 
Tagged
vanadium  

It is hard to see in the photos, but this specimen is hollow through the center. It is much like a crown full of black, very lustrous, 1-3mm Descloizite crystals. 


Descloizite

Formula
PbZnVO4(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Plumose, Tabular, Encrustations 
Cleavage
None, None, None 
Luster
Greasy (Oily) 
Color
dark brownish black, dark reddish brown, orange red, reddish brown, black 
Streak
light brownish green 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
3.5 
Collection
Arnold G Hampson Collection

Duftite

with Cerussite - #PD56457
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
PbCuAsO4(OH) 
Availability
Available
Price
$45.00
Size
3 x 2.5 x 2 cm - Thumbnail 
Tagged
arsenate , copper  

Little, less than 0.5mm, individual Duftite crystals in patches amongst nice, clear Cerussite crystals to 1.3cm.


Duftite

Formula
PbCuAsO4(OH) 
Mineralpedia
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