Ellinaite

ellinaite

rankinite

gehlenite

periclase

Images

Formula: CaCr2O4
Chromate, marokite supergroup
Crystal System: Orthorhombic
Specific gravity: 5.217 calculated
Hardness: 4½ to 5
Streak: Black
Colour: Black
Luminescence:
Environments

Metamorphic 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 chromitemagnesiochromite in a pyrometamorphic formation (reduced rankinitegehlenite paralava); also as an inclusion in a super-deep diamond. Associated minerals in the pyrometamorphic formation include rankinite, pyrrhotite, gehlenite and chromitemagnesiochromite. Associated minerals in the diamond are ferropericlase, magnesioferrite, graphite, orthorhombic MgCr2O4, and an unidentified iron carbide and graphite (Mindat).

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