Australian and New Zealand. A basalt used for building and construction.

A yellowish or brownish siliceous substance formed by the hydration and chemical alteration of basaltic glass, and occurring in vitreous…

Formerly, a basaltic rock containing plagioclase feldspar, pyroxene, and glass, with little or no olivine, and having an intersertal texture; in…

‘A black basaltic glass, formerly regarded as a homogeneous mineral’ (A. H. Chester Dict. Names Minerals).

A fine-grained variety of basalt.

A type of dolerite found in Shropshire.

a name formerly given to glassy varieties of basalt.

Name given to a class of volcanic rocks related to the basalts.

A type of basaltic rock varying quite widely in composition and distinguished by containing, in addition to augite, labradorite, and usually…

a dark, fine-grained or glassy intrusive rock resembling tachylite that results from vitrification by frictional heat generated during dynamic…

A melanocratic basaltic rock (see quots.).

Any of various dark-coloured basalts which are very rich in olivine.