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Thomsonite-Ca (Photo)

Year of discovery: 1820 (Old Kilpatrick, UK), 1896 (Japan)

Locality list: 94 localities of thomsonite-Ca

• NaCa₂Al₅Si₅O₂₀,6H₂O
• [Na⁺][Ca²⁺₂][(AlSiO₄)₅]^5-,6H₂O

• Class: Thomsonite series < Natrolite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Soluble in: HCl (Gel residue)
• Electrical: Pyroelectric

• Ca => Sr: Thomsonite-Sr

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

• Habit: Thin platy
• Aggregate: Radial

• Cleavage: Perfect on {010} (1 plane), Good on {100} (1 plane)
• Hardness: 5-5.5
• Density: 2.3

• System: Orthorhombic
• Group: mmm, Pncn
• Lattice: a=13.1, b=13.1, c=13.2

Etymology: Thomas Thomson, Scottish chemist