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Formula: BaFe3+12O19
Multiple oxide, hawthorneite subgroup of the
magnetoplumbite group
Crystal System: Hexagonal
Specific gravity: 5.31 calculated
Streak: Dark brown
Colour: Black
Magnetism: Strongly ferrimagnetic
Environments
Localities
The type locality is Har Ye'elim, Dead Sea, Southern District, Israel. Barioferrite is a new (approved in 2009)
practically pure BaFe end member of the magnetoplumbite group.
It has been discovered in a single specimen in only one of the numerous metamorphosed
baryte nodules found at the type locality in metamorphic rock. The rocks of
this formation belong to spurrite-merwinite and
pyroxene-hornfels facies. The
barioferrite-bearing baryte concretion differs from other nodules by
the presence in its centre of a calcite segregation surrounded by a dark
baryte zone enriched with
magnetite,
maghemite and barioferrite. The barioferrite forms random and
parallel aggregates of tiny platy black submetallic crystals up to 3 × 15 × 15 microns
(AM97.1818).
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