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Formula: (Mn3+0.5Sb5+0.5)Mg2O4
Oxide of manganese, antimony and
magnesium, ulvöspinel subgroup,
oxyspinel group,
spinel supergroup
Crystal System: Trigonal
Specific gravity: 4.58 calculated
Colour: Deep ruby-red
Environments
Localities
At the type locality, Jakobsberg Mine, Jakobsberg ore field, Nordmark mining district, Filipstad, Värmland County,
Sweden, tegengrenite occurs as deep red octahedra up to 150 μm in size, in
manganese ore. Associated minerals include
hausmannite, calcite,
brucite, dolomite,
clinohumite,
kinoshitalite, native copper,
barytocalcite, bindheimite
and cerussite
(Mindat).
Tegengrenite from Jakobsberg Mine -
Image
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