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Formula: Na2Ca(CO3)2
Anhydrous normal carbonate, orthorhombic paramorph of hexagonal
zemkorite
Crystal System: Orthorhombic
Specific gravity: 2.41 measured, 2.42 calculated
Streak: White
Colour: Colourless
Environments
Volcanic igneous environments
Carbonatites
Nyerereite occurs as phenocrysts in carbonate lavas, persistent due to rapid cooling. Associated minerals
include halite, sylvite,
fluorite, gregoryite and
calcite
(HOM). Nyerereite may occur as fluid inclusions in chromite
(Mindat).
Localities
At the type locality, Ol Doinyo Lengai, Ngorongoro District, Arusha region, Tanzania, nyerereite occurs
invariably as twinned crystals, embedded in rock in the
carbonatite volcano
(Mindat).
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