Which of the following types of minerals are Graphite and sillimanite?

Options :
  1. Refractory minerals
  2. Ferrous minerals
  3. Base minerals
  4. None of these
Answer and Explanation :-

Answer: Option 1

Explanation:

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The fool who knows his folly Becomes wise by that fact.But the fool who thinks he's wise - He's called 'a fool' indeed!
-Anonymous The Dhammapada