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Kellyite & Alleghanyite

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RSL598851

Kellyite & Alleghanyite

Rare Mineral

Description Tabs

Description
Locality: 
Bald Knob, Sparta, Alleghany County, North Carolina, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.5 × 1 cm
Description

Rare samll brilliant yellow micaceous flakes of kellyite in a matrix formed by kutnahorite (white-colorless), with associated alleghanyite (red-orange) and jacobsite (black). Very representative specimen.

Mineral Data
What's on the rock

Kellyite

Formula: 
Mn2+2Al(AlSiO5)(OH)4
Strunz: 
9.ED.15
Hardness: 
2.5
Type Locality: 
Bald Knob deposit (Primary ore body; Crouse Knob deposit), Bald Knob, Sparta, Alleghany Co., North Carolina, USA

Alleghanyite

Formula: 
Mn2+5(SiO4)2(OH)2
Strunz: 
9.AF.45
Crystal System: 
Monoclinic
Hardness: 
5.5
Type Locality: 
Bald Knob, Sparta, Alleghany County, North Carolina, United States of America