Mineral description : Bixbyite

Bixbyite crystals from Övre manganravinen, Ultevis. It is hard to see, but there are one big crystal showing ten crystal faces, and a number of smaller.

Mineral class	Oxides : Pyrolusite - Manganite group.
Chemical formula	(Mn,Fe)2O3
Crystal system	Cubic.
Habitus	Well developed cubes, sometimes with modified corners. Also as grainy aggregates.
Cleavage	[111] imperfect.
Hardness	6-6.5
Density	4.9-5.0
Color	Black.
Streak	Black.
Luster	Dull metallic, opaque.
Description
Occurance	In manganese ore bodies.
Associates
Notes	Named after the American mineralogist Maynard Bixby.
Locations	A relatively rare mineral. Ultevis, Lappland. Commonly as cubes in manganeese ore, as grainy aggregates in hollandite and as finegrained aggregates. Långban, Värmland. Rarely with alpha-vredenburgite in manganophyll scarn. Thomas range, Utah, USA.

To oxide index.

Mineral group index.

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