LOCALITIES.--Found in thin veins or elliptical masses, never in extensive layers like Pennsylvania coal. Near Richmond, Va.; Deep River, N. C.; Michigan, Missouri, Texas; Evanston, Utah; Coal Creek and Bellmonte, Col.; Boreman, Dearborn River and Greenhorn Gulch, Mont. 15.--CALAMINE. Occurs in crystals and masses; glossy lustre; harder than marble; brittle; heated it swells up, becomes opaque and emits a green light; dissolves, when powdered, in hot sulphuric acid without effervescence; gravity 3.4. VALUE.--An ore of zinc yielding from forty to sixty per cent. LOCALITIES.--Found in limestone rock with other ores. Friedensville, Perkiomen, Phœnixville, Lancaster and Selin’s Grove, Pa.; Austin’s Mines in Wythe County, Va.; Claiborne County, Tenn.; Jefferson County, Mo. 16.--CANNEL COAL. Occurs in compact masses; dull lustre; brittle, breaking with a curved surface; burns readily but does not melt; does not soil the fingers; gravity about 1.2. VALUE.--Used for fuel and for making gas, oil and ornaments. LOCALITIES.--Found in the Mississippi Valley; Kentucky; Lick, Ohio; Illinois; Moniteau County, Mo.; Kenawha County, Va.; Beaver County, Pa. 17.--CARNELIAN. Occurs in masses or pebbles; at first grayish, but by exposure to the sun becomes uniform flesh, red or brown, never striped,--although _Carnelian_ may form one of the bands of an _Agate_; brittle, breaking with a curved surface; very hard; takes a fine polish; glassy or resinous lustre; gravity 2.6. VALUE.--Used for jewelry. When of two layers, white and red, (properly called sardonyx,) it is used for cameos. LOCALITIES.--Same as _Agate_. 18.--CELESTINE. Occurs crystallized, fibrous and massive; color white, often faint bluish; glassy lustre; very brittle; under the blow-pipe crackles and melts, tinging the flame red; does not dissolve in acids; gravity 4. VALUE.--The source of nitrate of strontia, used in fire-works. LOCALITIES.--Found in limestone, gypsum and sandstone. Rossie, Schoharie, Chaumont Bay, Depauville and Stark, N. Y.; Frankstown, Pa.; Strontian and Put-in-Bay Islands, Lake Erie; near Nashville, Tenn.; Fort Dodge, Iowa. 19.--CERUSSITE. Occurs in crystals, in powder or masses; glassy lustre; brittle; dissolves in nitric acid with effervescence; heated strongly on charcoal crackles and fuses, giving a globule of lead; gravity 6.4. VALUE.--A rich ore of lead yielding seventy-five per cent. LOCALITIES.--Found in lead mines. Southampton, Mass.; Perkiomen, Phœnixville, Charlestown and Schuylkill, Pa.; Wythe County, Va.; Washington Mine, N. C.; Valle’s Diggings, Mine-la-Motte and Mine-a-Burton, Mo.; Davies and Rock Counties, Ill.; Blue Mounds, Wis.; Ingo County, Cal. 20.--CHROMIC IRON. Occurs in compact masses; powder dark brown; small pieces sometimes attracted by the magnet; brittle, breaking with uneven surface; with borax melts into a green globule; not acted upon by acids; little lustre; gravity 4.4. VALUE.--Used in making the chrome pigments.