31. Rock salt crystallizes in . . . . . . . . system.
32. CaF2 composition of mineral called as
33. Hardness of Iron pyrites
34. The rocks which are cooled at depths, very rate of slow cooling, results large coarse crystals called
35. Found the metallic mineral
36. Hardness of monazite
37. When a large embeded crystal in smaller ground mass, the texture is
38. Age in million year in precambrain period
39. When mineral break with curved carities the cracked surface called
40. Quartz mineral belong to
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