21. Streak of Limonite
22. Hydrated silicate of alluminium called as
23. Fluorspar hardness is
24. Hardness of Olivene varies from
25. The rocks which are produced from pre-existing rocks by the action of high temperature and pressure.
26. Hardness of Blende
27. Chemical composition of Rocksalt
28. Mica crystallizes in . . . . . . . . system.
29. Fossils are useful for
30. The polarizer is situated
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