| (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.
1.—Agate.
THIS stone is a mixture of several kinds of quartz, mainly the white, red, brown and black, disposed in layers or clouds. The layers are zigzag, circular or in straight bands (onyx). Occurs in irregular rounded masses; not very translucent; not altered by heat or acids; cannot be cut with a knife nor split into plates; takes a high polish; lustre glassy; gravity 2.5.
Value.—Used for jewelry and ornamental work, mortars, vases, knife-handles, burnishers, etc. The colors are deepened by boiling in oil and then in sulphuric acid.
Localities.—Found in granite and trap regions, generally by the shores of rivers, lakes and the sea; as, north-west shore of Lake Superior; Missouri, Columbia, Colorado and Connecticut Rivers; Crescent City, Cal.; Hancock County, Ga.; near Tampa Bay, Fla.; Fulton, Penn.; Yellowstone Lake, Wy.[3]
2.-Alum.
Occurs in mealy or solid crusts, often fibrous; dissolves in water; tastes sweetish-astringent; melts and froths up when heated.