निम्नलिखित में से किस खनिज को 'भूरा हीरा' (ब्राउन डायमंड) के नाम से भी जाना जाता है?

Among the given options, identify the mineral that belongs to the 'non-metallic' category.

The Kakrapar Atomic Power Plant is located in which Indian state?

The best-quality hard coal that contains 80% to 95% carbon content is known as ________.