trachybasalt

trachybasalt

[¦tra·kē·bə′sȯlt]
(petrology)
An extrusive rock characterized by calcic plagioclase and sanidine, with augite, olivine, and possibly minor analcime or leucite.
References in periodicals archive ?
In tephrite and trachybasalt the phenocryst of plagioclase, augite, olivine, pargasite and phlogopite are embedded in the groundmass of plagioclase, Ti-augite, pargasite, phlogopite, apatite, opaque minerals (ilmenite) and devitrified glass (Sawada et al.
The ultramafic unit is intruded by thin (a few meters to less than 2 cm wide) trachybasalts and surrounded and overlain by massive basalts, trachybasalts and basaltic trachy-andesite flows and breccias.
Basaltoid rocks are represented here by predominant tephrites and basanites, rare foidites, and singular basalts and trachybasalts (Bolewski and Parachoniak, 1982; Kozlowska-Koch, 1987; Wierzcholowski, 1993; Lorenc et al.