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Hollandite

#BM39808

Hollandite

#BM39808
Availability
Sold
Size
7 x 4.5 x 3 cm - Sm Cabinet 
Formula
BaMn2+Mn4+7O16 (RRUFF)
Locality
Ultevis, Lappland, Sweden

Hollandite is a basic Mn-oxide with barium in the structure. These are good sized crystals from any regard approaching over 5cm. Usually Hollandite occurs as tiny acicular crystals in sprays.

Hollandite

Formula
BaMn2+Mn4+7O16 
Crystal System
Monoclinic 
Crystal Habit
Striated, Prismatic, Acicular 
Cleavage
Good, None, None 
Luster
Earthy (Dull) 
Color
grayish black, black, silver gray 
Streak
black 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
4-6 

Data courtesy of Webmineral.

Collection
McConlogue Collection

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