A rock of igneous source composed of augite and triclinic feldspar with grains of magnetized or titanic iron also bottle-green particles of olivine frequently disseminated
- the commonest types of solidified lava; a dense dark gray fine-grained igneous rock that's composed mainly of plagioclase feldspar and pyroxene
- A rock of igneous origin, comprising augite and triclinic feldspar, with grains of magnetized or titanic iron, and bottle-green particles of olivine regularly disseminated.
- An imitation, in pottery, of normal basalt; a kind of black porcelain.
c.1600, from belated Latin basaltes, misspelling of Latin basanites "very difficult rock," from Greek basanites "a species of slate always test silver," from basanos "touchstone." Maybe not related to sodium. Said by Pliny ["Historia," 36.58] to be an African term, possibly Egyptian bauhan "slate." Any difficult, extremely dark rock would do as a touchstone; the assayer contrasted the streak remaining by the alleged gold thereupon of genuine silver or baser metals. Therefore Greek basanizein "becoming put toward test, analyzed closely, cross-examined, is put to torture."
(letter.) A rock of igneous beginning, comprising augite and triclinic feldspar, with grains of magnetized or titanic iron, and bottle-green particles of olivine frequently disseminated.
- (n.) An imitation, in pottery, of all-natural basalt; some sort of black colored porcelain.
With the exception of the coral and a small amount of calcareous sandstone, the rocks are entirely volcanic and range from basalt to trachyte, but are mainly basalt.