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Jacobsite - Wessels Mine, Hotazel, Kalahari manganese field, Northern Cape, South Africa
(#:MINS8238)
Blackish, very lustrous Jacobsite in matrix up to 1.5 mm. Rare sample with sharp, well defined crystals on matrix with garnets in association.
Formula :
(Mn
2+
,Fe
2+
,Mg)(Fe3+,Mn
3+
)
2
O
4
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.
Specimen weight:5 gr.
Crystal size:up to 1.5 mm
Overall size: 26mm x 18 mm x 14 mm
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