malchite

malchite

[′mal‚kīt]
(petrology)
A fine-grained lamprophyre with small, rare phenocrysts or hornblende, labradorite, and sometimes biotite embedded in a matrix of hornblende, andesine, and some quartz.
References in periodicals archive ?
One of the more unusual forms consist of filaments or hairs of malchite. Masses of these fine filaments were sometimes exposed when breaking open host rock known to contain malachite.