Crednerite

crednerite

psilomelane

hausmannite

mendipite

Images

Formula: CuMnO2
Multiple oxide
Specific gravity: 4.98 to 5.34
Hardness: 4
Streak: Brownish black
Colour: Bright grey to iron black
Solubility: Soluble in hydrochloric acid with the evolution of chlorine; insoluble in nitric acid (Dana)
Environments

Hydrothermal environments

Crednerite is a low-temperature secondary oxide of manganese and copper, perhaps indicating a reducing chemical environment (Webmin, HOM).

Localities

At the type locality, the Glücksstern Mine, Gottlob Hill, Friedrichroda, Gotha, Thuringia, Germany, crednerite is intergrown with psilomelane and hausmannite, associated with malachite, baryte, volborthite, calcite and manganese oxides (Dana, HOM).

At Higher Pitts, Mendip Hills, Somerset, England, UK, crednerite occurs with cerussite, hydrocerussite, mendipite and manganese oxides (Dana, HOM).

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