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Romanèchite & Pyrolusite On Dolomite

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PJM134767

Romanèchite & Pyrolusite On Dolomite

Description Tabs

Description
Locality: 
Iron Duke Mine, Middleback Range, Eyre Peninsula, South Australia, Australia
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.7 × 5 × 4.9 cm
Description

A dolomite nodule collected at the Iron Duke Opencut Easter of 1982 has been opened to reveal numerous black radial sprays of  acicular crystals of romanechite an uncommon barium manganese oxide on dolomite crystals

Mineral Data
What's on the rock

Romanèchite

Formula: 
(Ba,H2O)2Mn5O10
Strunz: 
4.DK.10
Hardness: 
5.0 - 6.0
Type Locality: 
Manganese deposit, Romanèche-Thorens, La Chapelle-de-Guinchay, Saône-et-Loire, Burgundy, France

Pyrolusite

Formula: 
MnO2
Strunz: 
4.DB.05
Hardness: 
2.0 - 6.5

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White
Earthstones Australia

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