sannaite

sannaite

[′san·ə‚īt]
(petrology)
An extrusive rock containing phenocrysts of barkevikite, pyroxene, and biotite (in order of decreasing abundance) in a fine-grained to dense groundmass of alkali feldspar, acmite, chlorite, calcite, and pseudomorphs of mica after nepheline.
References in periodicals archive ?
The basaltic rocks correspond to the uncommon lavas called sannaites, which display both potassic and lamprophyric features (Lemaitre, 2004).