B.
WILL NOT SCRATCH GLASS.
I. OPAQUE.
| Harder than white marble.[2] | Softer than white marble. |
| (1) Black: 11, 35, 47. | 4, 7, 10, 12, 13, 14, 16, 24, 34, 37, 49, 51, 55, 56, 76. |
| (2) Brown: 66, 75. | 12, 14, 21. |
| (3) Red: 44, 53, 75. | 21, 23, 41, 55. |
| (4) Yellow: 26, 44. | 12, 33, 56. |
| (5) Green: 45. | 60, 61. |
| (6) Gray: 35, 66. | 5, 24, 31, 34, 36, 49, 56, 6,3 69. |
| (7) White: 6, 9, 11. | 36, 40, 56, 62. |
II. TRANSLUCENT.
| (1) Black: 11. | 55. |
| (2) Brown: 9, 11, 65, 66. | 48. |
| (3) Red: 9, 11, 18, 53, 78. | 36, 55. |
| (4) Yellow: 9, 11, 15, 29, | 48, 71. 47, 78. |
| (5) Green: 29, 45, 65, 70. | 48, 60, 61. |
| (6) Blue: 8, 18, 29, 47. | |
| (7) Gray: 19, 47, 65, 66. | 37, 69. |
| (8) White: 18, 47. | 2. |
| (9) Mottled or Banded: 47. |
CHAPTER III.
DESCRIPTIVE LIST OF USEFUL MINERALS.
THE GEMS—PRECIOUS METALS—VALUABLE ORES AND USEFUL MINERALS OF THE UNITED STATES FROM AGATE TO ZINC—THEIR DISTINGUISHING CHARACTERS, USES AND LOCALITIES—A MINERALOGY FOR MINERS.