Heulandite-K

heulandite-K

clinoptilolite-K

Images

Formula: (K,Ca,Na)₅(Si₂₇Al₉)O₇₂.26H₂O
Tectosilicate (framework silicate), heulandite subgroup, zeolite group, forms a series with clinoptilolite-K
Crystal System: Monoclinic
Specific gravity:
Hardness: 3 to 3½
Streak: White
Colour: White, Colorless, Red, Yellow, Brown, Green
Environments

Basaltic cavities

Localities

The type locality is near Albero Bassi locality, Santorso, Vicenza Province, Veneto, Italy.

At Contrada Re, Cerealto, Valdagno, Vicenza Province, Veneto, Italy, clear, colourless crystals of heulandite-K have been found (Mindat photo).
Heulandite-K from Contrada Re - Image

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