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Kidwellite With Strengite & Rockbridgeite

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QRI633394

Kidwellite With Strengite & Rockbridgeite

Former collection Alex Kidwell
Rare Mineral

Description Tabs

Description
Locality: 
Coon Creek Mine, Shady, Polk County, Arkansas, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 4.6 × 3.6 cm
Largest Crystal: 
0.30cm
Weight: 
96.00gr
Description

A rare specimen of a dark rockbridgeite-rich matrix with a couple vugs filled with dark green kidwellite aggregates and a number of pale purple spheres of lustrous strengite.

Very rich specimen of great quality and with a significant pedigree: former collection A. Kidwell (label included). The label reports goethite as well, although I could not discern it from the massive rockbridgeite.

Previous labels supplied (not photographed)
Mineral Data
What's on the rock

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

Strengite

Formula: 
FePO4·2H2O
Strunz: 
8.CD.10
Hardness: 
3.5 - 4.0
Streak: 
white
Type Locality: 
Eleonore Mine, Rodheim-Bieber, Wetzlar, Hesse, Germany

Rockbridgeite

Formula: 
Fe2+Fe3+4(PO4)3(OH)5
Strunz: 
8.BC.10
Crystal System: 
Orthorhombic
Hardness: 
3.5 - 4.5
Type Locality: 
Midvale Mine, South Mountain, Midvale, Rockbridge Co., Virginia, USA

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