Multiple oxide, manganese-bearing mineral
Specific gravity: 4.71
Hardness: 5 to 6
Streak: Brownish black to black
Colour: Iron black to grey
Romanèchite is a weathering product of manganese-bearing oxides,
carbonates, and silicates in
It also occurs as replacement deposits in limestone and
dolostone, and is a principal component of
“psilomelane" formed on rocks in arid regions
It is associated with pyrolusite,
At the Mount Kelly deposit, Gunpowder District, Queensland, Australia, the copper ores overlie primary zone mineralisation consisting of quartz-dolomite-sulphide veins hosted in siltstone and schist. Romanèchite occurs as globules to 2 mm with chrysocolla, lining fractures in siltstone (AJM 22.1.22).
In the Caldbeck Fells, Cumbria, England, UK, romanèchite is common in lead veins at many mines (JRS9.39-44).
At Burdell Gill, Coombe Height, Caldbeck, Allerdale, Cumbria, England, UK, romanèchite is associated with pyrolusite (JRS8(1).1-9).
At Dry Gill Mine, Caldbeck, Allerdale, Cumbria, England, UK, romanèchite occurs as sooty black deposits or botryoidal aggregates, associated with mimetite variety campylite (AESS).
At Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK, romanèchite is associated with pyromorphite (JRS11.3-28).
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