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(mineralogy) An evaporite, consisting of a mixed sodium and calcium carbonate, with the chemical formula Na₂Ca(CO₃)₂·5H₂O.
Colorless, white, yellow, and grey – Tabular prismatic crystals also granular – Perfect [110] – Conchoidal, brittle – 2.5 – Vitreous – White – 1.93 – 1.99 – Biaxial (−) – Nα = 1.444 nβ = 1.516 nγ = 1.523 – Δ = 0.079 – Decomposes in water – Efflorescent.