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Formula: CaCr2O4
Chromate,
marokite supergroup
Crystal System: Orthorhombic
Specific gravity: 5.217 calculated
Hardness: 4½ to 5
Streak: Black
Colour: Black
Luminescence:
Environments
Ellinaite is a new mineral, approved in 2019. It is formed at high-temperature (>1000oC), but variable
pressure
(Mindat).
Localities
There are three co-type localities, the Sorriso river, Juína, Mato Grosso, Brazil, and Halamish wadi and Zohar wadi,
both in the Hatrurim Basin, Tamar Regional Council, Southern District, Israel.
The type material appears as subhedral grains up to 30 µm, or as rims over zoned
chromite–magnesiochromite
in a pyrometamorphic formation
(reduced rankinite–gehlenite
paralava); also as an inclusion in a super-deep
diamond. Associated minerals in the pyrometamorphic formation include
rankinite, pyrrhotite,
gehlenite and
chromite–magnesiochromite.
Associated minerals in the diamond are
ferropericlase,
magnesioferrite, graphite,
orthorhombic MgCr2O4, and an unidentified iron carbide
and
graphite
(Mindat).
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