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Pronunciation varies by accent · noun
(mineralogy) A syenitic rock consisting of microperthite, arfvedsonite, aegirine and, possibly, nepheline..
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.
Use umptekite when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Umptekite means (mineralogy) A syenitic rock consisting of microperthite, arfvedsonite, aegirine and, possibly, nepheline..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
The rock-mass in which this umptekite form of hornblende occurs may therefore be called umptekite gabbro.
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