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Kidwellite with Rockbridgeite

#BN53070

Kidwellite with Rockbridgeite

#BN53070
Availability
Available
Price
$60.00
Size
7.5 x 5 x 6 cm - Sm Cabinet 
Formula
NaFe3+9(PO4)6(OH)11·3H2O (RRUFF)
Locality
York mine, Polk Co., Arkansas, United States
Tagged
phosphate

Light green spherical Kidwellite groups to over 5mm on black, botryoidal Rockbridgeite. The Rockbridgeite ID is an assumption. It quite possible be Dufrenite. There is some minor Beraunite. Under the scope you will see several prismatic crystals which have either been coated or replaced by the black stuff. The centers of the Kidwellites all have an unidentified rusty red interior. 

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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