Koktaite Locality: Žeravice, South Moravia Region, Moravia (Mähren; Maehren), Czech Republic Field of view 5 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Koktaite
Koktaite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (NH₄)₂Ca(SO₄)₂·H₂O.
Key properties: specific gravity 2.09; optically biaxial.
IMA symbol Kkt, grandfathered status — known before the IMA’s founding, named in 1948.
On waste piles of a lignite mine.
It is found associated with Gypsum, mascagnite, tschermigite.
The mineral was named to honor Jaroslav Kokta (1904–1970), Czech chemist who analyzed the synthetic compound.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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