Quadridavyne

quadridavyne

olivine

leucite

betzite

Images

Formula: [(Na,K)₆Cl₂][Ca₂Cl₂][(Si₆Al₆O₂₄)]
Tectosilicate (framework silicate), cancrinite group of the feldspathoid group, paramorph of betzite
Crystal System: Hexagonal
Specific gravity: 2.335 measured, 2.354 calculated
Hardness: 5
Streak: White
Colour: Colourless
Luminescence: Not fluorescent under UV
Common impurities: S
Environments

Volcanic igneous environments
Hydrothermal environments

Localities

At the type locality, Ottaviano, Metropolitan City of Naples, Campania, Italy, quadridavyne occurs as transparent, colourless, prismatic crystals, with a hexagonal outline, up to 2 mm in length and 0.5 mm across. It occurs in volcanic ash samples that also contain lithic fragments composed of metasomatised and hydrothermally altered lavas and scoriae, from the 1906 eruption of Vesuvius (Mindat, HOM). It has been found associated with olivine, leucite and black amphibole (Mindat photo).
Quadridavine fom Mount Vesuvius - Image

Back to Minerals