Formula: Ca₆(Si₆O₁₇)(OH)₂

Species: Silicates – (Inosilicates)

Colour: White, grey, pale pink, colorless

Lustre: Vitreous, Silky, Pearly

Hardness: 6½

Specific Gravity: 2.70 – 2.72

Crystal System: Monoclinic

Name: Named in 1866 by Karl Friedrich August Rammelsberg after its discovery locality, Tetela de Xonotla, Mexico.

Type Locality: Tetela de Ocampo (Tetela; Tetella de Ocampo), Tetela de Ocampo Municipality, Puebla – Mexico