Formula: CaAl₂Si₃O₁₀ · 3H₂O

Species:

Colour: colorless, white , pink, salmon, red, green

Lustre: Vitreous

Hardness: 5 – 5½

Specific Gravity: 2.25 – 2.29

Crystal System: Monoclinic

Member of: Natrolite Subgroup > Zeolite Group

Name: From the Greek, σκώληξ (skolex) = ‘worm’ in reference to the mineral’s reaction to the blowpipe flame.