Mineral description : Hollandite

Mineral class Oxides : Pyrolusite - manganite group

Chemical formula Ba₂Mn₈O₁₆
Ba(Mn²⁺,Mn⁴⁺)₈O₁₆

Crystal system Monoclinic pseudo Quadratic (Tetragonal)

Habitus As elongated prismatic crystals. Also as fibric aggregates.

Cleavage Clear prismatic cleavage.

Hardness 6, less on fracture surfaces.

Density 4.95

Color Dark gray to black.

Streak Dark brown to black.

Luster Metallic.

Description

Occurance

Associates Baryte, microcline.

Notes Litterature : Litofilen 1997:2

Locations An uncommon mineral with a good locality in Sweden.

Ultevis district (Stuor Njuoskes, Sörhårås, Tjatitvare), Lappland. As up to 50 cm fibric or columnar crystal aggregates in manganese ore veins.

To oxides index.
Mineral group index.
Main index.

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Last changed : 1998-03-07

Mineral class	Oxides : Pyrolusite - manganite group
Chemical formula	Ba₂Mn₈O₁₆ Ba(Mn²⁺,Mn⁴⁺)₈O₁₆
Crystal system	Monoclinic pseudo Quadratic (Tetragonal)
Habitus	As elongated prismatic crystals. Also as fibric aggregates.
Cleavage	Clear prismatic cleavage.
Hardness	6, less on fracture surfaces.
Density	4.95
Color	Dark gray to black.
Streak	Dark brown to black.
Luster	Metallic.
Description
Occurance
Associates	Baryte, microcline.
Notes	Litterature : Litofilen 1997:2
Locations	An uncommon mineral with a good locality in Sweden. Ultevis district (Stuor Njuoskes, Sörhårås, Tjatitvare), Lappland. As up to 50 cm fibric or columnar crystal aggregates in manganese ore veins.