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Laubmannite

#BN49587

Laubmannite

#BN49587
Availability
Sold
Size
4.5 x 3.5 x 2 cm - Miniature 
Formula
(Fe3+,Fe2+,M)8+x(OH,H2O)9(H2O)2(PO4)5, M = Fe3+ (RRUFF)
Locality
Buckeye Mountain, Polk Co., Arkansas, United States
Tagged
phosphate

Laubmannite is a combination of several rare phosphate minerals: Kidwellite, Dufrenite, and Beraunite. Each is a different phosphate phase of similar compositions producing concentric color zones. This is a real nice specimen.

Laubmannite

Formula
Fe++3Fe+++6(PO4)4(OH)12 
Crystal System
Orthorhombic 
Luster
Vitreous - Silky 
Color
brown, greenish brown, grayish green, yellow green, dark green 
Streak
greenish 
Class
Orthorhombic 
Fracture
Brittle 
Hardness
3.5-4 

Data courtesy of Webmineral.

Collection
Dr. Buford Nichols Collection

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