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Formula: CuMnO2
Multiple oxide, manganese-bearing mineral
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
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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