Chapman, Carleton A. Department of Geology, University of Illinois, Urbana, Illinois.
- Additional Reading
Igneous rocks rich in leucite but lacking or poor in alkali feldspar. Those types with essential alkali feldspar are classed as phonolites, feldspathoidal syenite, and feldspathoidal monzonite. The group includes an extremely wide assortment both chemically and mineralogically.
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