Multiple choice

Which of the following are feldspar minerals? (A) Celsian (B) Crystobalite (C) Heulandite (D) Anorthite

  1. (A) and (D)

  2. (C) and (D)

  3. (A), (B) and (C)

  4. (C) and (B)

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because the felspars are most important rock minerals in which Ba++, K+, Ca++, are linked with three dimensional framework of the SiO4 and AlO4 in tetrahedron. Celsian and anorthite are best known examples of  felspar. (Celsian = BaAl2Si2O8, and Anorthite = CaAl2Si2O8)

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