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umptekite. In DICTIOUS you will not only get to know all the dictionary meanings for the word
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English
Noun
umptekite (countable and uncountable, plural umptekites)
- (mineralogy) A syenitic rock consisting of microperthite, arfvedsonite, aegirine and, possibly, nepheline.
1905, John Henry Sears, Essex Institute, The Physical Geography, Geology, Mineralogy and Paleontology of Essex County, Massachusetts, page 213:
- The rock-mass in which this umptekite form of hornblende occurs may therefore be called umptekite gabbro.
1920, Alfred Reginald Schultz, Oil Possibilities in and Around Baxter Basin, page 85:The Beverly syenite includes the alkaline syenites of Beverly, Manchester, Salem, and Marblehead, comprising pulaskites and umptekites.
1956, The Quarterly Journal of the Geological Society of London, page 210:There Strauss & Truter record a gradual transition from the white umptekite (fenite) to a pulaskitic rock with nepheline.
References
- Mindat.org, Hudson Institute of Mineralogy, 2000–2024.