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(mineralogy) A monoclinic-prismatic mineral containing aluminum, calcium, hydrogen, oxygen, and silicon.
Partheite – Tectosilicate minerals – Zeolite group – Ca₂Al₄Si₄O₁₅(OH)₂·4H₂O – Pth – 9.GB.35 – Monoclinic – Prismatic (2/m) – C2/c – White, colorless – Fibrous, radial – {100} and {110} – 4 – Vitreous – White – 2.39 – 2.45 – Biaxial (+) – Nα = 1.547 – 1.550 nβ = 1.549 – 1.552 nγ = 1.559 – 1.565 – Δ = 0.012 – 0.015.