Anukruti posted an Question
October 09, 2020 • 01:46 am 30 points
  • IIT JAM
  • Geology (GG)

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    Sajan sarthak best-answer

    Nepheline and Leucite are silica undersaturated minerals (low silica) content, Leucite has relatively more silica than Nepheline. Nepheline- NaAlSiO4 Leucite- KAlSi2O6 Hypersthene- (Mg,Fe)2Si2O6 Orthoclase- KAlSi3O8. option A should be the answer

  • comment-profile-img>
    Rahul kumar

    As you can see that there are two SiO2 (silica) in Leucite formula whereas in Nepheline formula there is only one SiO2; that's why Leucite contains comparatively more silica than Nepheline.

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    ok sir

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    sir among feldspathoids we have to remember the formula of leucite,nepheline,sodalite,lazurite ,scapolite??then only we can know which has more less silica?

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    Yes, sometimes you need to remember the formula. However, such questions are obsolete.

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    ok sir

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    Rahul kumar Best Answer

    Answer(a): Nepheline, Leucite, Hypersthene, Orthoclase Nepheline- NaAlSiO4 Leucite- KAlSi2O6 Hypersthene- (Mg,Fe)2Si2O6 Orthoclase- KAlSi3O8 Nepheline and Leucite are silica undersaturated minerals (low silica) content, Leucite contains relatively more silica than Nepheline.

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    sir how will i know leucite or nepheline which is more silica undersatuarated???that is my problem both are feldspathoids

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