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Psilomelane

#AH56040
SOLD
Psilomelane from near Guernsey, Wyoming, United States - AH56040
Psilomelane from near Guernsey, Wyoming, United States - AH56040

Psilomelane

#AH56040
Availability
Sold
Size
6 x 3 x 3 cm - Sm Cabinet 
Formula
MnOx (RRUFF)
Locality
near Guernsey, Wyoming, United States

Black arborescent habit Mn oxide lined with crystalline and vuggy Quartz. Psilomelane is not an IMA approved mineral. It is in-fact an obsolete name and can also be called just "Manganese-Oxide" or "wad".

Psilomelane

Formula
(Ba,H2O)2Mn5O10 
Crystal System
Monoclinic 
Crystal Habit
Botryoidal, Reniform, Mammillary 
Cleavage
None, None, None 
Luster
Sub Metallic 
Color
iron black, dark steel gray 
Streak
brownish black 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
5-6 

Data courtesy of Webmineral.

Collection
Arnold G Hampson Collection
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