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Gyrolite (Photo)

Year of discovery: 1851 (The Storr, UK), 1962 (Japan)

Locality list: 12 localities of gyrolite

• Ca₄Si₆O₁₅(OH)₂,3H₂O
• [Ca²⁺₄][(OH)₂|(Si₂O₅)₃]^8-,3H₂O

• Class: Phyllosilicate - Hydroxide - Hydrate
• Fluorescence: UV excitation (White)

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

• Habit: Thin platy

• Cleavage: Perfect (1 plane)
• Hardness: 2.5
• Density: 2.5

• System: Triclinic, Trigonal (1T), Hexagonal (6H) (Layer-stacking polytype)
• Lattice: a=9.7, b=9.7, c=22.4, α=95.7, β=91.5, γ=120.0