Davyne

davyne

leucite

nepheline

vesuvianite

Images

Formula: [(Na,K)₆(SO₄)_0.5Cl][Ca₂Cl₂][(Si₆Al₆O₂₄)]
Tectosilicate (framework silicate), cancrinite group
Crystal System: Hexagonal
Specific gravity: 2.42 to 2.53 , 2.50 calculated
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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