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Riya Sen posted an Question
October 16, 2021 • 22:11 pm 30 points
  • IIT JAM
  • Geology (GG)

63. the silica deficient mineral is: a olivine c. feldspathoid b. feldspar d. amphibole (bhu-2013)

63. The silica deficient mineral is: A Olivine C. Feldspathoid B. Feldspar D. Amphibole (BHU-2013)

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    Saurabh 1 Best Answer

    This one should be Feldspathoid. As there is not enough silica present to satisfy the requirements of all the major silicate minerals, the silica deficiency being accommodated by the crystallization of feldspathoids like nepheline, leucite in place of feldspar, the feldspathoids containing less silica in their structure than feldspars, usually in case of silica undersaturated igneous rocks. So correct option is (C).

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    why not olivine?? Olivine is also a silica deficient mineral na??

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