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Beraunite with Kidwellite

#BN53075

Beraunite with Kidwellite

#BN53075
Availability
Sold
Size
10 x 9 x 5 cm - Cabinet 
Formula
Fe2+Fe3+5(PO4)4(OH)5·6H2O (RRUFF)
Locality
Three Oaks Gap, Polk Co., Arkansas, United States
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

Data courtesy of Webmineral.

Collection
Dr. Buford Nichols Collection
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