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SSC CGL 2021 PYQ — Question 29

SSC CGL - 16 Aug 2021 - Shift 3 • General Awareness • Q29

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Topaz is a ______ of fluorine and aluminium.

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Correct answer: D

Explanation

The correct answer is option 4 i.e. Silicate.

  • Topaz is a silicate of fluorine and aluminium. 
  • In other terms, it's a fluorine-containing aluminium silicate.
  • It's the hardest silicate material on the planet.
  • It's made up of fluorine-bearing vapours released during the final phases of igneous rock crystallisation.
  • It reflects light with a low index of refraction.