Name:

pyrolusite

A photo of the mineral pyrolusite

Class:

Oxide/Hydroxides

Chemistry:

MnO2 Manganese Oxide

Color(s):

steel gray to iron black

Hardness:

6 - 6.5

SpecGrav:

4.9 - 5.1

Fracture:

uneven

Cleavage:

complete

Crystal:

Tetragonal (prismatic, often radiating fibrous)

Envronment:

secondary manganese deposits, and secondary veins. Forms under oxidizing conditions

Association:

Manganite, psilomelane, limonite

Locals:

Germany | Ukraine | S. Africa | Brazil | Michigan,Arkansas/USA |

Misc:

found as tubers on deep ocean floors, it is the main ore of manganese. Soluble in HCL. The name is derived from the Greek, and translated as "fire wash", as it was added to glass to remove iron stain.

Photos
& Locals:

1.) Taylor Mine, Michigan
2.) Taylor Mine, Michigan (Closeup)
3.) Taylor Mine, Michigan

4.) Taylor Mine, Michigan (Closeup)
5.) Taylor Mine, Michigan (Closeup)
6.) Taylor Mine, Michigan

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