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Southeast US Phosphates

Thursday, 23 April 2020 08:00 PM

Introducing the "Southeast US Phosphates" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including beraunite, cacoxenite and more from places like Three Oaks Gap, Polk Co., Arkansas, United States, Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States, Brewer mine, Cedartown, Polk Co., Georgia, United States, and Boar Tusk Mtn., Polk Co., Arkansas, United States.

Beraunite

with Kidwellite - #BN53060
Locality
Three Oaks Gap, Polk Co., Arkansas, United States 
Formula
Fe2+Fe3+5(PO4)4(OH)5·6H2
Availability
Sold
Size
6.5 x 4 x 3 cm - Sm Cabinet 
Tagged
phosphate  

The Beraunite on this specimen is perhaps unsurpassed by any other of the like. I have others on this update but these crystals seem to be sharper and more distinct. The crystals are a deep red, prismatic and striated and measure to 6 or 7mm. On the right side the Kidwellite covers the Beraunite with a dark green color.

Throughout this special edition I am keeping the historic identification as "Beraunite". Several of the Mindat localities in this part of the USA have switched the ID to Eleonorite. It is impossible to discern the the differnces visually. The two are of the same composition. Only the stoichiometery is diiferent. And it's a very subtle difference between ferrous and ferric iron.


Beraunite

Formula
Fe2+Fe3+5(PO4)4(OH)5·6H2
Crystal System
Monoclinic 
Crystal Habit
Druse, Radial, Globular 
Cleavage
Good, None, None 
Luster
Vitreous - Dull 
Color
green, greenish brown, gray green, dark greenish brown, dark red 
Streak
green brown 
Class
Monoclinic - Prismatic 
Hardness
Collection
Dr. Buford Nichols Collection
Mineralpedia
View Beraunite
On Dakota Matrix
Previously Sold Beraunite
On Dakota Matrix
Other Available Beraunite
WebMineral
View Beraunite
Mindat
View Beraunite

Beraunite

with Kidwellite - #BN53075
Locality
Three Oaks Gap, Polk Co., Arkansas, United States 
Formula
Fe2+Fe3+5(PO4)4(OH)5·6H2
Availability
Sold
Size
10 x 9 x 5 cm - Cabinet 
Tagged
phosphate  

A crazy rich specimen with bands of superb, deep red, lath-like crystals of Beraunite to 6mm. The bands are up to 1.3cm. On the Beraunite are globular Kidwellite. The matrix is a "novaculite", which is a localized term for siliceous chert. 

It was collected by Meredith York, one of the members of the famous "Coon Creek" gang. Dr. Buford Nichols, one of the members, obtained it from York. This group along with Michael Howard served the mineral community well and was the source of many of these fine specimens. Howard wrote a great book called "Mineral Species of Arkansas - A Digest" published in 1987 by the Arkansas Geological Survy, Bulletin 23. I would highly recommend it as it is concise and well written.


Beraunite

Formula
Fe2+Fe3+5(PO4)4(OH)5·6H2
Crystal System
Monoclinic 
Crystal Habit
Druse, Radial, Globular 
Cleavage
Good, None, None 
Luster
Vitreous - Dull 
Color
green, greenish brown, gray green, dark greenish brown, dark red 
Streak
green brown 
Class
Monoclinic - Prismatic 
Hardness
Collection
Dr. Buford Nichols Collection
Mineralpedia
View Beraunite
On Dakota Matrix
Previously Sold Beraunite
On Dakota Matrix
Other Available Beraunite
WebMineral
View Beraunite
Mindat
View Beraunite

Cacoxenite

#DO46634
Locality
Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States 
Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Availability
Sold
Size
6 x 5 x 3 cm - Sm Cabinet 
Tagged
phosphate  

Beautiful full spherical and radiating crystal groups of Cacoxenite less than 1mm in size on a red iron-oxide matrix. It is not as rich as some of the others in this update.

The specimen was collected by the late Don Owens. Don was prolific mineral collector, who was a member of the "Coon Creek Association", which also included some of the best mineralogists of our time: Mike Howard, the late Henry de Linde, the late Al Kidwell, the late Art Smith, and Buford Nichols. I never had the pleasure of meeting Don, however Henry de Linde hosted me while I viewed his collection several years ago. The other Union Carbide specimens in this Special Edition were also collected by Don Owens. 


Cacoxenite

Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Crystal System
Hexagonal 
Crystal Habit
Radial, Acicular, Stellate 
Cleavage
None, None, None 
Luster
Silky 
Color
brownish yellow, green, yellow, golden yellow, red yellow 
Streak
yellow 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
Collection
Don Owens Collection

Cacoxenite

#DO46635
Locality
Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States 
Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Availability
Sold
Size
4.5 x 4 x 3 cm - Miniature 
Tagged
phosphate  

Golden fibrous crystals less than 1mm filling vugs in limonitic matrix.


Cacoxenite

Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Crystal System
Hexagonal 
Crystal Habit
Radial, Acicular, Stellate 
Cleavage
None, None, None 
Luster
Silky 
Color
brownish yellow, green, yellow, golden yellow, red yellow 
Streak
yellow 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
Collection
Don Owens Collection

Cacoxenite

#BN53077
Locality
Brewer mine, Cedartown, Polk Co., Georgia, United States 
Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Availability
Sold
Size
5.5 x 4 x 2.5 cm - Sm Cabinet 
Tagged
phosphate  

Tiny, less than 1mm, orange sprays of Cacoxenite.


Cacoxenite

Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Crystal System
Hexagonal 
Crystal Habit
Radial, Acicular, Stellate 
Cleavage
None, None, None 
Luster
Silky 
Color
brownish yellow, green, yellow, golden yellow, red yellow 
Streak
yellow 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
Collection
Dr. Buford Nichols Collection

Cacoxenite

#BN53080
Locality
Boar Tusk Mtn., Polk Co., Arkansas, United States 
Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Availability
Sold
Size
4 x 3 x 2.5 cm - Miniature 
Tagged
phosphate  

Fibrous golden crystals of Cacoxenite. Not real rich, but the area where the best crystals are located is 12x8mm.


Cacoxenite

Formula
(Fe3+)24AlO6(PO4)17(OH)12·75H2
Crystal System
Hexagonal 
Crystal Habit
Radial, Acicular, Stellate 
Cleavage
None, None, None 
Luster
Silky 
Color
brownish yellow, green, yellow, golden yellow, red yellow 
Streak
yellow 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
Collection
Dr. Buford Nichols Collection

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