Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . manufacture of soluble phosphates for fertilizers. Florida,South Carolina and Tennessee produced 1,738,372 long tons ofphosphate rock| in 1899. phosphoric acid is renderedavailable for the use of plants by treating the rock with sulphuricacid. Fluorite has an increasing use as a flux in melting iron and * Mineral Industries, nth Census, p. 6l. \ Engineering and Mining Journal, 1900, p. 2. X Engineering and Mining Journal, 1900, p. 2. 04 DESCRIPTIVE MINERALOGY. other metallurgical operations. It
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . manufacture of soluble phosphates for fertilizers. Florida,South Carolina and Tennessee produced 1,738,372 long tons ofphosphate rock| in 1899. phosphoric acid is renderedavailable for the use of plants by treating the rock with sulphuricacid. Fluorite has an increasing use as a flux in melting iron and * Mineral Industries, nth Census, p. 6l. \ Engineering and Mining Journal, 1900, p. 2. X Engineering and Mining Journal, 1900, p. 2. 04 DESCRIPTIVE MINERALOGY. other metallurgical operations. It is also used in producingopalescent glass and enamels and in the manufacture of hydro-fluoric acid. In i899§ 24,170 tons were mined in the UnitedStates. FLUORITE.—Fluor Spar. Composition,—CaF2, (Ca , F per cent). General Description.—Usually found in glassy transparentcubes or cleavable masses of some decided yellow, green, purpleor violet color. Less frequently granular or fibrous. Massivevarieties are often banded in zigzag strips of different colors. Fig. 506. Fig. o V Fig. 509. Northumberland. Fig. 510.
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