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Name: |
pyrolusite |
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Class: |
Oxide/Hydroxides |
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Chemistry: |
MnO2 Manganese Oxide |
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Color(s): |
steel gray to iron black |
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Hardness: |
6 - 6.5 |
SpecGrav: |
4.9 - 5.1 |
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Fracture: |
uneven |
Cleavage: |
complete |
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Crystal: |
Tetragonal (prismatic, often radiating fibrous) |
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Envronment: |
secondary manganese deposits, and secondary veins. Forms under oxidizing conditions |
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Association: |
Manganite, psilomelane, limonite |
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Locals: |
Germany | Ukraine | S. Africa | Brazil | Michigan,Arkansas/USA | |
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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. |
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Photos |
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1.) Taylor Mine, Michigan |
4.) Taylor Mine, Michigan (Closeup) |
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