51. Limestone consists of
52. Gold comes under metallic mineral group.
53. The rocks which are cooled at intermediate depths faster rate of cooling results smaller size crystals called
54. The precambrian period also called
55. The mineral deposit in solid rock called
56. The plane of fracture in fault called
57. Carbonisation process calssified into . . . . . . . . types.
58. Specific gravity of Galena around
59. Phosphate of cerium metal is
60. Hardness number of talc is
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