Gregoryite
A potassium-sodium carbonate — one of the two minerals in the unique carbonatite lava of Tanzania's Ol Doinyo Lengai volcano.
Intro adapted from Wikipedia (CC BY-SA).
Gregoryite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Na₂(CO₃).
Key properties: specific gravity 2.27.
IMA symbol Ggy, IMA status: approved, named in 1980.
Occurs as phenocrysts in lengaite carbonatite lava.
It is found associated with Nyerereite, alabandite, halite, sylvite, fluorite, calcite.
The mineral was named to honor Professor John Walter Gregory (1864–1932), University of Melbourne, Melbourne, Australia and University of Glasgow, Glasgow, Scotland.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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