Davyne

davyne

leucite

nepheline

vesuvianite

Images

Formula: [(Na,K)6(SO4)0.5Cl][Ca2Cl2][(Si6Al6O24)]
Tectosilicate (framework silicate), cancrinite group
Specific gravity: 2.42 to 2.53
Hardness: 5½ to 6
Streak: White
Colour: Colourless, white
Solubility: Gelatinises with acids
Environments

Volcanic igneous environments

Davyne occurs in volcanic ejecta and leucite-rich lavas. Common associates include leucite, nepheline, orthoclase, garnet, vesuvianite and scapolite (Dana, mindat, HOM).

Localities

The type locality is Monte Somma, Somma-Vesuvius Complex, Naples, Campania, Italy.

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