Minerals in the Scale of Hardness

1. Talc
2. Gypsum var. Alabaster
3. Calcite
4. Fluorite
5. Apatite
6. Feldspar var. Microcline
7. Quartz
8. Beryl

Streak, Luster, Cleavage Fracture, Specific Gravity

9. Onyx
10. Spodumene
11. Galena
12. Chalcopyrite
13. Magnetite
14. Magnetite var. Lodestone
15. Gypsum var. Selenite
16. Gypsum var. Satin Spar
17. Limonite
18. Halite
19. Chalcedony
20. Barite
21. Lepidolite
22. Pyrite

Rock Forming Minerals

23. Mica var. Muscovite
24. Mica var. Biotite
25. Dolomite
26. Amphibole var. Hornblende
27. Feldspar var. Plagioclase
28. Olivine
29. Pyroxene var. Augite
30. Garnet
31. Sulfur
32. Graphite Schist

Ores of Metals and Non-Metals

33. Molybdenite
34. Quartz var. Rose
35. Bauxite
36. Pyrolusite
37. Malachite
38. Hematite
39. Rhodinite

Igneous Rocks

40. Pumice
41. Scoria
42. Basalt
43. Rhyolite
44. Granite
45. Pegmatite
46. Diorite
47. Anorthosite
48. Tuff
49. Gabbro
50. Monzonite
51. Obsidian
52. Andesite
53. Trachyte

Sedimentary Rocks

54. Arkose
55. Fossiliferous Limestone
56. Bituminous Coal
57. Oolitic Limestone
58. Limestone
59. Calcareous Tufa
60. Travertine
61. Conglomerate
62. Shale
63. Breccia
64. Oil Shale
65. Sandstone

Metamorphic Rocks

66. Amphibolite
67. Slate
68. Marble
69. Quartzite
70. Hornfels
71. Mica Schist
72. Chlorite Schist
73. Phyllite
74. Gneiss
75. Anthracite Coal