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Formula: Na2(CO3)
Anhydrous carbonate
Crystal System: Hexagonal
Specific gravity: 2.27 calculated
Colour: Brown, milky white
Environments
Localities
At the type locality, Ol Doinyo Lengai, Ngorongoro District, Arusha region, Tanzania, gregoryite occurs as
phenocrysts in natrocarbonatite lava. Associated minerals
include nyerereite,
alabandite, halite,
sylvite, fluorite and
calcite
(HOM).
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