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,
In the Caldbeck Fells, Cumbria, UK, romanèchite is common in lead veins at many mines (JRS9.39-44).
At Burdell Gill it is associated with pyrolusite(JRS8(1).1-9), and at Roughton Gill it is associated with pyromorphite (JRS11.3-28).
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