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nepheline |
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nephelineor nepheliteMost common feldspathoid mineral, an aluminosilicate of sodium and potassium (Na3KAl4Si4O16). It is sometimes used as a substitute for feldspars in the manufacture of glass and ceramics. nepheline [′nef·ə‚lēn] (mineralogy) A mineral of variable composition, with its purest state represented by the formula NaAlSiO4; calcium, magnesium, iron (Fe2+and Fe3+), and titanium are usually present in only minor or trace amounts. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| 62 Ga--emplacement of small post-tectonic granite, nepheline syenite, and carbonatite intrusions, and protracted post-metamorphic hydrothermal activity focused mainly along fault zones. This statistical market research report covers feldspar, leucite, nepheline and nepheline syenite. All basalt chemical compositions can be plotted in the basalt tetrahedron, which has normative quartz, olivine, nepheline and augite at the apices. |
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