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feldspathoid
(redirected from feldspathoids)

    Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.17 sec.

feldspathoid

Any of a group of alkali aluminosilicate minerals similar to the feldspars in composition but having a lower silica-alkali ratio or containing chloride, sulfide, sulfate, or carbonate. Their physical and chemical properties lie between those of the feldspars and zeolites. The most abundant feldspathoids are nepheline and leucite. Other significant varieties include kalsilite, sodalite, nosean, and haüynite. Feldspathoids are found chiefly in igneous and metamorphic rocks; they are used as raw materials in the production of alum, glass, and ceramics.



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