Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Hot Springs, 578. Herkimer, Co., N. Y. Fig. Qialcedony, Antwerp, N. V. Agate. Schlottwitz, Saxony. D. In ADDITION TO THESE, there are Flint.—Smoky-gray to nearly black, translucent nodules, foundin chalk-beds. Touchstone.—Velvet-black and opaque, on which metal streaksare easily made and compared. Sandstones.—Quartz grains cemented by silica, iron oxide, clay,calcium carbonate, etc. Quartzite, compact quartz, granular or slaty in structure. 3SO DESCRIPTIVE MINERALOGY. Remarks.—Quartz i
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Hot Springs, 578. Herkimer, Co., N. Y. Fig. Qialcedony, Antwerp, N. V. Agate. Schlottwitz, Saxony. D. In ADDITION TO THESE, there are Flint.—Smoky-gray to nearly black, translucent nodules, foundin chalk-beds. Touchstone.—Velvet-black and opaque, on which metal streaksare easily made and compared. Sandstones.—Quartz grains cemented by silica, iron oxide, clay,calcium carbonate, etc. Quartzite, compact quartz, granular or slaty in structure. 3SO DESCRIPTIVE MINERALOGY. Remarks.—Quartz is chiefly found as an original constituent of such rocks asgranite, gneiss, etc , formed by igneous or plutonic action, and also, to a very largeextent,as a deposit from solution in water. Silicates are attacked by carbonatedwaters, forming carbonates of calcium, magnesium, sodium, etc., and leaving a resi-due of silica. This, in turn, is soluble in hot solutions of these same carbonates, andis dissolved, transported, and, by evaporation and cooling, is redeposited, filling seams,cavities, veins, etc. Quartz is the most common of all solid
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