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(mineralogy) A silicate mineral associated with zeolites, having the chemical formula (CaSi₂O₅·2H₂O).

Okenite – Phyllosilicate minerals – CaSi₂O₅·2H₂O – Oke – 9.EA.40 – Triclinic – Pinacoidal (1) – P1 – A = 9.69, b = 7.28 – C = 22.02 [Å]; α = 92.7° – Β = 100.1°, γ = 110.9°; Z = 2 – White, may show slightly yellow or blue tint – Bladed crystals, typically fibrous, clusters of curved crystals and radial balls – Lamellar – Perfect on {001} – Splintery – Elastic – 4+1⁄2–5 – Vitreous, pearly – White – Transparent, translucent – 2.28–2.33 – Biaxial (−) – N_α = 1.512 – 1.532 n_β = 1.514 – 1.535 n_γ = 1.515 – 1.542 – Δ = 0.003 – 0.010 – Measured: 60°.