11. Alluminium occurs in
12. The chemical combination of muscavite mica
13. Example of occurance of minerals in two or more elements.
14. Ores useually occurs in
15. Calorific value of lignite is
16. Coal, when heated in the absence of air to a temperature above 600°C, from solid residue called
17. Hardness of Dolomite
18. UHV of 'D' grade coal in KCal/kg.
19. Orthoclase hardness number
20. Rock for mining minerals have specific gravity between . . . . . . . .
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