Natrolite
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Natrolite is a tectosilicate mineral species belonging to the zeolite group. It is a hydrated sodium and aluminium silicate with the formula Na₂Al₂Si₃O₁₀·2H₂O. The type locality is Hohentwiel, Hegau, Germany.
It was named natrolite by Martin... Wikipedia
Cleavage: Perfect on
Hardness: 5.5
Color: White, colorless, sometimes pink
Crystal class: Pyramidal (mm2); H–M symbol: (mm2)
Crystal habit: Acicular
Crystal system: Orthorhombic
Dana classification: 77.01.05.01