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Xonotlite (Photo) [abbr. Xon ]

Year of discovery: 1866 (Tetela de Xonotla, Mexico), 1939 (Japan)

Locality list: 28 localities of xonotlite

• Ca₆Si₆O₁₇(OH)₂
• [Ca²⁺₆][OH|HSi₆O₁₈]^12-

• Class: Inosilicate (Single chain) - Hydroxide
• Soluble in: dilute HCl (Gel residue)
• Fluorescence: UV excitation (Gray)

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

• Habit: Acicular
• Aggregate: Radial, Columnar vertical to vein plane

• Cleavage: Good
• Hardness: 6.5
• Density: 2.7

• System: Monoclinic (Ma2bc, Ma2b2c), Triclinic (A2a2bc), Pseudorthogonal (POR2a2bc, PORa2b2c) (Layer-stacking polytype)
• Group: 2/m, P2/a
• Lattice (P2/a): a=17.0, b=7.4, c=7.0, β=90.4
• Lattice (A2/a): a=17.0, b=7.4, c=14.0, β=90.4
• Lattice (P-1): a=8.7, b=7.4, c=7.0, α=90.0, β=90.4, β=102.2