(n.) An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene.
Example Sentences:
Plagioclase
Definition:
(n.) A general term used of any triclinic feldspar. See the Note under Feldspar.
Example Sentences:
(1) Quantitative analysis by IR, XRD, and visible spectrophotometry requires a preliminary phosphoric acid digestion of the ash sample to remove the plagioclase silicate material which interferes with the determination by these methods.