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Kidwellite with Beraunite

#BN53053

Kidwellite with Beraunite

#BN53053
Availability
Sold
Size
4.5 x 2.5 x 2.5 cm - Miniature 
Formula
NaFe3+9(PO4)6(OH)11·3H2O (RRUFF)
Locality
York mine, Polk Co., Arkansas, United States
Tagged
phosphate

This is a little gem of a specimen showing the cross-sections of Kidwellite spheres. The sections are 1mm across and are concentrically zoned in color and probably composition. You would need to scan these with an EDS to determine the chemical phases and would probably turn up Dufrenite and Rockbridgeite. The Beraunite is on the sides of the specimen as embedded dark red blades.

Kidwellite

Formula
NaFe3+9(PO4)6(OH)11·3H2
Crystal System
Monoclinic 
Crystal Habit
Fibrous, Columnar 
Cleavage
Perfect, None, None 
Luster
Silky 
Color
greenish yellow, greenish white, yellow, light green 
Streak
yellow 
Class
Monoclinic - Prismatic 
Hardness

Data courtesy of Webmineral.

Collection
Dr. Buford Nichols Collection

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