Formula: NaCa₂Si₃O₈(OH)

Species:

Colour: Colourless, white, pale pink, greenish, pale blue

Lustre: Sub-Vitreous, Silky

Hardness: 4½ – 5

Specific Gravity: 2.84 – 2.9

Crystal System: Triclinic

Member of: Wollastonite Group; Pectolite-Serandite Series; Constitutes serandite-schizolite-pectolite series.

The calcium analogue of: Sérandite.

Name: Named in 1828 by Franz von Kobell from the Greek πηκτοζ for “well put together”, in allusion to its resistance to pulverization.

Co-Type Localities: Monzoni Mountains, Trento Province (Trentino), Trentino-Alto Adige (Trentino-South Tyrol), Italy; Sano, Mori, Trento Province (Trentino), Trentino-Alto Adige (Trentino-South Tyrol), Italy