| Webster's Online Dictionary |
| Domain | Definition | ||
| Mining | A. Leucite nephelinite b. A dark-colored extrusive rock intermediate in composition between leucitite and nephelinite with phenocrysts of clinopyroxene in a dense groundmass of leucite, nepheline, and clinopyroxene. The name is not included in the IUGS classification of extrusive igneous rocks. (references) | ||
Source: compiled by the editor from various references; see credits. | Top | ||