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Phillipsite-Ca (Photo)

Year of discovery: 1825 (Lower Salt Lake Tuff, USA), 1949 (Japan)

Locality list: 48 localities of phillipsite-Ca

• Ca₃Al₆Si₁₀O₃₂,12H₂O
• (Ca,Ba,K₂,Na₂)_4-7Al_4-7Si_12-9O₃₂,12H₂O
• [Ca²⁺₃][(Al₃Si₅O₁₆)₂]^6-,12H₂O

• Class: Phillipsite series < Gismondine group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Soluble in: HCl (Gel residue)
• Radioactive: Very weak

• Ca => K₂: Phillipsite-K (Series)
• Ca => Na₂: Phillipsite-Na (Series)
• Ca => Ba: Harmotome (Series)

• Color: White, Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Habit: Thick tabular, Crossed shape by twin
• Twin: Intrusive twin to form a cross

• Cleavage: Distinct on {010} (1 plane), Indistinct on {001} (1 plane)
• Hardness: 4-5
• Density: 2.2

• System: Monoclinic, Pseudotetragonal
• Group: 2/m, P2₁/m
• Lattice: a=9.9, b=14.4, c=8.7, β=124.8

Etymology: J. W. Phillips (1775-1828), British mineralogist