shonkinite

shonkinite

[′shäŋ·kə‚nīt]
(petrology)
A dark-colored syenite composed principally of augite and orthoclase with some olivine, hornblende, biotite, and nepheline.
References in periodicals archive ?
The Sikhote Alin complex consists of small potassium-alkali-rich intrusions (shonkinite, essexite-diabase, trachyandesite, leucitic trachyte) with high boron and titanium content.