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Kidwellite with Beraunite

#BN53082

Kidwellite with Beraunite

#BN53082
Availability
Sold
Size
12 x 8 x 7 cm - Cabinet 
Formula
NaFe3+9(PO4)6(OH)11·3H2O (RRUFF)
Locality
Three Oaks Gap, Polk Co., Arkansas, United States
Tagged
phosphate

This specimen rivals specimen #53060 for the best Beraunite. Specimen #53076, is also exceptional for Beraunite crystals.

This specimen shows a smaller area crystals versus the overal size of the specimen itself. Again the Beraunite is outstanding. It is like the others, a deep flashy red and is long bladed to about 2-3mm. The Kidwellite is a nice shade of green and occurs as distinct beads and globular groups. The matrix is that hard novaculite stuff, which is some kind of siliceous perhaps metamorphosed chert.

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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