MINERALS INDEX
Psilomelane |
| Hydrous manganese oxide |
| Amorphous |
On the dump of the Noble mine at Sterling Hill were found a few rather large, compact masses of coal-black manganese oxide which appear to be psilomelane. Tills mineral has never been recorded from the locality, but it is very likely a product of the alteration of franklinite, which has also led to the formation of chalcophanite and hydrohetaerolite.
Large amounts of black or brown claylike material, rich in manganese and probably of the nature of wad, intervened in places between the calamine bed and the limestone wall rock on which it rested. The instability of this layer of soft material caused much trouble in mining the calamine.
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© by Herb Yeates 1997-2006.
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page created: August 12, 2006 6:47 PM
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