Korukivihiomo Kiurunen mineralgallery. Pyrolusite. Mineral item: 016

PYROLUSITE

Name	Pyrolusite
Formula	MnO₂
Hardness (Mohs)	6-6.5 6 in individual crystals 2-6 in massive
Density	5.06
Crystal System	Tetragonal
Colour	Steel gray to a solid black
Lustre	Metallic lustre
Associated minerals	Hematite
Overall size of mineral specimen	40 x 35 x 30 millimetres.
Location	Rukatunturi, Kuusamo, Finland