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Clintonite (Photo) [abbr. Cln ]

Year of discovery: 1843 (Amity, USA), 1930 (Japan)

Locality list: 12 localities of clintonite

• CaAlMg₂(Al₃Si)O₁₀(OH)₂
• [Ca²⁺][Al³⁺][Mg²⁺₂][(OH)₂|Al₃SiO₁₀]^9-

• Class: Trioctahedral < Brittle mica group < Mica supergroup
• Class: Phyllo-Aluminosilicate - Hydroxide

• Color: Colorless, Pale green, Reddish brown
• Streak: White
• Luster: Pearly
• Diaphaneity: Transparent-Translucent

• Habit: Hexagonal platy
• Aggregate: Radial

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 4-5
• Density: 3.1

• System: Monoclinic (1M, 2M₁), Triclinic (3A) (Layer-stacking polytype)
• Group: 2/m, C2/m
• Lattice: a=5.2, b=9.0, c=9.8, β=100.4

Synonym: Xanthophyllite