General Information:
Chemical Formula:
(Al,Fe++,Fe+++,Mg,Ti,Zn)11O15(OH)
Environment:
Metamorphosed iron ore deposits.
IMA Status:
Approved IMA 1963
Locality:
Ruoutevare district, Lapland, Norway.
Name Origin:
Named for Arvid Gustaf Hogbom (1857-1940), Swedish geologist, University of Upplala and the crystal structure.
Physical Properties:
Cleavage:
[0001] Imperfect
Color:
black.
Density:
3.81
Diaphaniety:
Subtranslucent to opaque
Habits:
Tabular - Form dimensions are thin in one direction., ,
Hardness:
6.5 - Pyrite
Luminescence:
Non-fluorescent.
Luster:
Adamantine
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