Answer» Correct Answer - Option 4 : 2, 3 and 4 only
The correct answer is 2, 3, and 4 only. - As per Govt. of India Notification S.O. 423(E) dated 10th February 2015 Bentonite has been declared as 'Minor Mineral'. Hence statement 1 is not correct.
- The Central Government has declared the following minerals as minor minerals:
- Boulder, shingle, chalcedony pebbles used for ball mill purposes only, lime shell, kankar.
- And limestone used in kilns for the manufacture of lime used as a building material.
- Murrum, brick-earth, fuller’s earth, bentonite, road metal, reh-matti.
- Slate and shale when used for building material, marble, stone used for making household utensils.
- Quartzite and sandstone when used for purposes of building or for making road metal and household utensils, saltpeter, and ordinary earth
- Used or filling or leveling purposes in construction or embankments, roads, railways, building.
- Bentonite is essentially a highly plastic clay containing not less than 85% clay mineral, montmorillonite.
- Chromite (Cr) is the single commercially viable ore of chromium which is chemically known as iron chromium oxide (Fe.Cr2O4).
- Kyanite, Sillimanite, and andalusite are anhydrous aluminosilicate minerals that have the same chemical formula Al2O3 but differ in the crystal structure and physical properties.
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