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Cronstedtite Vivianite & Siderite

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FNW56639

Cronstedtite Vivianite & Siderite

Description Tabs

Description
Locality: 
Brunita Open Pit, La Paraleja, La Unión, Murcia, Spain
Size Range: 
Miniature (4.5-7 cm)
Size: 
3 × 6.5 × 3.9 cm
Description

Rich specimen with many black metallic cronstedtite crystals with a 2 mm terminated vivianite crystal and orange siderite crystals, in a matrix mainly composed of massive pyrite.

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

Vivianite

Formula: 
Fe2+3(PO4)2·8H2O
Strunz: 
8.CE.40
Crystal System: 
Monoclinic
Hardness: 
1.5 - 2.0
Type Locality: 
Wheal Kind (Wheal Kine), West Wheal Kitty group, St Agnes, St Agnes District, Cornwall, England, UK

Siderite

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