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Seamanite Shigaite & Pyrobelonite

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JYJ758486

Seamanite Shigaite & Pyrobelonite

Description Tabs

Description
Locality: 
Iron Monarch Open Cut, Iron Knob, Middleback Range, Eyre Peninsula, South Australia, Australia
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.2 × 1.3 × 1.2 cm
Description

Pale pink seamanite, yellow shigaite and dark red pyrobelonite on matrix.

Brown crystals are triploidite. 

Mineral Data
What's on the rock

Seamanite

Formula: 
Mn2+3[B(OH)4](PO4)(OH)2
Strunz: 
6.AC.65
Crystal System: 
Orthorhombic Small acicular crystals.
Hardness: 
4.0
Streak: 
White
Type Locality: 
Chicagon mine, Menominee iron range, Iron Co., Michigan, USA

Shigaite

Formula: 
Mn6Al3(OH)18[Na(H2O)6][SO4]2·6H2O
Strunz: 
7.DD.35
Hardness: 
0.0
Type Locality: 
Ioi mine, Ritto City, Shiga Prefecture, Kinki Region, Honshu Island, Japan

Pyrobelonite

Formula: 
PbMn2+(VO4)(OH)
Strunz: 
8.BH.40
Hardness: 
3.5
Type Locality: 
Långban, Filipstad, Värmland, Sweden