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Vermiculite (Photo) [abbr. Vrm ]

Year of discovery: 1824 (Millbury, USA), 1895 (Japan)

Locality list: 144 localities of vermiculite

• Mg₃Si₄O₁₀(OH)₂,4H₂O
• (Mg,Fe,Al)₃(Al,Si)₄O₁₀(OH)₂,4H₂O
• [Mg²⁺₃][(OH)₂|(Si₂O₅)₂]^6-,4H₂O

• Class: Trioctahedral < Vermiculite group < Mica supergroup
• Class: Phyllosilicate - Hydroxide - Hydrate

• Mg₂ => NaAl: Montmorillonite

• Color: Brown, Yellowish brown, Colorless
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Platy

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 1.5-2
• Density: 2.5

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=5.2, b=9.2, c=28.6, β=94.6