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.
The Flambeau mine, Ladysmith, Wisconsin
Encyclopedia browser ?
Full browser ?