Geology. A green sandstone occurring in northern Ireland. Obsolete.

a green-stone consisting chiefly of hornblende.

A variety of greenstone, n., consisting of hornblende combined with a triclinic feldspar (albite or oligoclase).

attributive, esp. as hypersthene rock: = hypersthenite, n.

A dark granite-like aggregate of hypersthene and labradorite; also called hyperite, n. and norite, n.

A coarse-grained plutonic rock similar to gabbro but with orthopyroxene (usually hypersthene) dominant over clinopyroxene.

A compact dark-coloured hornblende rock, so uniform in texture that it shows no distinct grains (whence its name), and breaks with a smooth…

A name for various rocks allied to Diabase and to Diorite; sometimes = hypersthenite, n.