Formula: Na₂Ca₂Si₉Al₆O₃₀ · 8H₂O

Species: Silicates – (Tectosilicates)

Colour: Colorless, white, gray, yellowish

Lustre: Vitreous

Hardness: 5

Specific Gravity: 2.26

Crystal System: Orthorhombic

Member of: Natrolite Subgroup > Zeolite Group

Name: From the Greek for meso = middle and lithos = stone, for its chemical composition is between that of natrolite and scolecite.