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Laubmannite

#64141
SOLD
Laubmannite from York mine, Polk Co., Arkansas, United States - 64141
Laubmannite from York mine, Polk Co., Arkansas, United States - 64141

Laubmannite

#64141
Availability
Sold
Size
2.5 x 2 x 1.9 cm - Thumbnail 
Formula
(Fe3+,Fe2+,M)8+x(OH,H2O)9(H2O)2(PO4)5, M = Fe3+ (RRUFF)
Locality
York mine, Polk Co., Arkansas, United States
Tagged
phosphate

Greenish concentric layers of Laubmannite. 

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.

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