Meaning of umptekite | Babel Free

Definitions

A syenitic rock consisting of microperthite, arfvedsonite, aegirine and, possibly, nepheline.

countable, uncountable

Examples

“The rock-mass in which this umptekite form of hornblende occurs may therefore be called umptekite gabbro.”

“The Beverly syenite includes the alkaline syenites of Beverly, Manchester, Salem, and Marblehead, comprising pulaskites and umptekites.”

“There Strauss & Truter record a gradual transition from the white umptekite (fenite) to a pulaskitic rock with nepheline.”

CEFR level