Value.—Extensively used in dyeing and calico-printing, candle-making, dressing skins, clarifying liquors and in pharmacy.
Localities.—Found incrusting and impregnating dark slaty rocks, with yellow streaks. Cape Sable, Md.; Cleveland County, N. C.; coal slates on Ohio River, and in caves in Sevier, De Kalb, Coffee and Franklin Counties, Tenn.; also Esmeralda and Storey Counties, Nev.
3.—Amethyst.
Same as Rock Crystal, but colored purple or bluish violet. Generally in clustered crystals.
Value.—When clear and finely colored, it is a favorite gem.
Localities.—Usually found with agate. Keweenaw Point, Pic Bay and Gargontwa on Lake Superior; Bristol, R. I.; Surry, N. H.; East Bradford, Aston, Chester, Thornbury, Edgemont, Sadsbury, Birmingham, Middletown and Providence, Penn.; Greensboro, N. C.
4.—Anthracite.
Occurs massive; compact; high lustre; brittle; breaks with a curved surface; will not scratch marble; burns, but not readily, with a pale blue flame and little smoke; will not form coke by roasting; gravity 1.4 to 1.8.
Value.—Used for fuel and sometimes cut into inkstands, etc.
Localities.—Found in beds between slates and sandstones, and east of the Alleghany range only, as Eastern Pennsylvania; Portsmouth, R. I.; Mansfield, Mass.; North Carolina. No workable beds will be found in New York.