|Mineral class||Oxides : Pyrolusite - Manganite group|
|Habitus||Dendritic or massive fibric aggregates. Crystals are prismatic but very rare.|
|Cleavage||Perfect, uneven fracture.|
|Color||Matte black to dark gray.|
|Streak||Black to bluish black.|
|Luster||Metallic to earthy.|
|Occurance|| As dendritic forms in Dolomite cracks.|
As massive fibric aggregates.
Pyrolusite is a secondary mineral in manganese occurances.
Also forms asnodules in the oceans and as precipitate in lakes.
|Notes||Soluble in hydrochloric acid.|
| To silicate index.
|| Mineral group index.
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