Series Formula: Na₄Al₃Si₉O₂₄Cl to Ca₄Al₆Si₆O₂₄CO₃

Species: Silicates – (Tectosilicates)

Crystal System: Tetragonal

Member of: Scapolite Group

Name: Named in 1800 by José Bonifácio de Andrada e Silva from the Greek ζκαποζ meaning “a shaft” in allusion to the long prismatic habit of the crystals.

A series between Marialite and Meionite. This term generally refers to just the marialite-meionite series, not the full scapolite group, so excludes the sulphate-bearing group member silvialite. Used as a generic term when the exact chemical composition in the solid solution series has not been determined.