Stilbite-(Na)

stilbite-(Na)

stilbite

zeolite

basalt

Images

Formula: Na₉(Si₂₇Al₉)O ₇₂.28H₂O

Tectosilicates (framework silicates), stilbite subgroup of the zeolite group
Crystal System: Monoclinic
Specific gravity: 2.1 to 2.2 measured, 2.2 calculated
Hardness: 3½ to 4
Streak: White
Colour: White, red, yellow, brown, cream
Solubility: Moderately soluble in hydrochloric acid
Environments

Basaltic cavities

Stilbite-(Na) occurs in amygdaloidal cavities in basalts and similar rocks (Webmin).

Localities

The type locality is Capo di Pula, Pula, Metropolitan City of Cagliari, Sardinia, Italy.

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