Blackish, very lustrous Jacobsite in matrix up to 1 mm. Rare sample with sharp, well defined crystals on matrix with garnets in association.
Formula :
(Mn2+,Fe2+,Mg)(Fe3+,Mn3+)2O4
System: cubic Hardness:5½-6 Rarity:not common
Strunz id:IV/B.2-30 -
OXIDES and HYDROXIDES
Name origin: Named in 1869 by Augustin Alexis Damour for the type locality of Jakobsberg, Sweden.
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 Specimen weight:6 gr.
 Crystal size:up to 1 mm
 Overall size: 26mm x 17 mm x 12 mm
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