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Felspathoid group of minerals

The feldspathoids are anhydrous framework silicates. The amount of silica in them is lesser than felspars. Nepheline, leucite, and sodalite are the important members of this group, which are being discussed in the below lines. (1). Nepheline: Nepheline contains Sodium or Potassium with AlSiO4. Its chemical formula is (Na,K)AlSiO4. Some important physical properties of nepheline …