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Eleonorite Kidwellite & Dufrénite

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PDM801400

Eleonorite Kidwellite & Dufrénite

Description Tabs

Description
Locality: 
Three Oak Gap, Polk County, Arkansas, United States of America
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.4 × 3 × 1.7 cm
Description

Radial aggregates of spear-like eleonorite crystals of deep red-orange colour, associated to lime green kidwellite, dark green dufrenite, and minor yellow cacoxenite in a limonite matrix.

Found by Michael Howard in 1995.

Mineral Data
What's on the rock

Eleonorite

Formula: 
Fe3+6(PO4)4O(OH)4 · 6H2O
Group Parent: 
Beraunite Group
Crystal System: 
Monoclinic
Hardness: 
3½ - 4
Colour: 
red, reddish brown
Type Locality: 
Eleonore Mine, Rodheim-Bieber, Wetzlar, Hesse, Germany & Rotläufchen Mine, Waldgirmes, Wetzlar, Hesse, Germany

Kidwellite

Formula: 
NaFe3+9(PO4)6(OH)11·3H2O
Strunz: 
8.DK.20
Hardness: 
3.0
Streak: 
yellow
Type Locality: 
Fodderstack Mountain, Norman, Montgomery Co., Arkansas, USA

Dufrénite

Formula: 
Ca0.5Fe2+Fe3+5(PO4)4(OH)6·2H2O
Strunz: 
8.DK.15
Hardness: 
3.5 - 4.5
Streak: 
Green
Type Locality: 
Anglar, Haute-Vienne, Limousin, France

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