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Cronstedtite On Siderite

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MMM36438

Cronstedtite On Siderite

Description Tabs

Description
Locality: 
Wheal Jane, Kea, Cornwall, United Kingdom
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 2 × 1 cm
Description

A partial sphere of tetragonal marcasite on which there are several well formed crostedtite crystals to 4 mm all sitting on a matrix of crystalline siderite.

From the 5 Sub Level, Wheal Jane Mine.

A sweet thumbnail that displays well.

Mineral Data
What's on the rock

Cronstedtite

Formula: 
Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4
Strunz: 
9.ED.15
Crystal System: 
Monoclinic, Trigonal, Hexagonal
Hardness: 
3.5
Type Locality: 
Příbram, Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White