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Pyrolusite

#PD31049

Pyrolusite

#PD31049
Availability
Sold
Size
3 x 7 x 3 cm - Sm Cabinet 
Formula
MnO2 (RRUFF)
Locality
Ilfeld, Harz, Germany
Tagged
classic locality

Solid Pyrolusite showing excellent radiating sprays of this manganese oxide to 3.5cm from this classic locality. Comes with a University of Chicago label acquired in 1959 from E. Richter out of the Mitchell Gunnell collection.

Pyrolusite

Formula
MnO2 
Crystal System
Tetragonal 
Crystal Habit
Reniform, Dendritic, Earthy 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
steel gray, iron gray, bluish gray 
Streak
black 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Brittle 
Hardness
6-6.5 

Data courtesy of Webmineral.

Collection
Phillips Collection

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