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Margarite [abbr. Mrg ]

Year of discovery: 1823 (Großer Greiner, Austria), 1964 (Japan)

Locality list: 22 localities of margarite

• CaAl₄Si₂O₁₀(OH)₂
• [Ca²⁺][Al³⁺₂][(OH)₂|(AlSiO₅)₂]^8-

• Class: Dioctahedral < Brittle mica group < Mica supergroup
• Class: Phyllo-Aluminosilicate - Hydroxide
• Soluble in: HCl (Decompose)
• Fluorescence: UV excitation (Blue)

• CaAl => KSi: Muscovite

• Color: White,Pink
• Streak: White
• Luster: Pearly
• Diaphaneity: Transparent-Translucent

• Habit: Foliate

• Cleavage: Good on {001} (1 plane)
• Hardness: 4
• Density: 3.0

• System: Monoclinic (2M₁) (Layer-stacking polytype)
• Group: 2/m, C2/c
• Lattice: a=5.1, b=8.8, c=19.2, β=95.2