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Beraunite with Kidwellite

#BN53060

Beraunite with Kidwellite

#BN53060
Availability
Sold
Size
6.5 x 4 x 3 cm - Sm Cabinet 
Formula
Fe2+Fe3+5(PO4)4(OH)5·6H2O (RRUFF)
Locality
Three Oaks Gap, Polk Co., Arkansas, United States
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

Data courtesy of Webmineral.

Collection
Dr. Buford Nichols Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Beraunite
On Dakota Matrix
Other Available Beraunite
WebMineral
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Mindat
View Beraunite

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