nepheline
IPA: nˈɛfɪɫaɪn
noun
- (mineralogy) A feldspathoid mineral of silica-poor igneous, plutonic and volcanic rocks. Chemically, nepheline is a plagioclase feldspar with insufficient silica to satisfy the chemical bonds. Because of the unfilled bonds, nepheline weathers rapidly and can only be seen as inclusions in freshly broken rock.
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Examples of "nepheline" in Sentences
- I don't think nepheline syenites are ultrapotassic...
- The same distinction holds between elaeolite and nepheline.
- Perovskite, apatite, nepheline and garnet may also be present.
- She might be named after nepheline, but then she'd be Nephelenia.
- The natural silicate is a feldspar, a nepheline or nepheline syenite.
- The chemical peculiarities of the nepheline syenites are well marked.
- Sodalite or hauyne may also be present, but nepheline is typically absent.
- It also occurs as a hydrothermal alteration product of corundum and nepheline.
- Extremely iron rich olivine is rare, but is present in some nepheline syenite.
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