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212 QUARTZ FAMILY. masses of chrysoprase are to be seen in the Cathedral Church in Prague. Observations. 1. Its distinguishishing characters are its apple-green colour, its even and dull fracture, its semi-transparency, and its hardness. Colour, and inferior hardness, distin guish it from Common Calccdony; and the dull even frac ture, with greater hardness, are the characters by which it is distinguished from Opal. Some observers have con founded it with Prase, from which it is readily distin guished by colour, the want of lustre, generally evert fracture, greater transparency, hardness, and weight. 2. It passes into Opal and Splintery Hornstone. 3. The name Chrysoprase, Chrysoprasus). is derived from the Greek, which signifies a mineral, of which the colour is green, passing into yellow. We are ignorant of the stone which the ancients described under this name. Lehman was the first who applied it to the green stone of Kosemitz. Vid. Histoire de F^cademic Royaledes Sciences et Belles Lettres, anne 1755; Berlin, 1757, p. 202. Vid. also Meinecke’s Monograph, intituled, “ Ueber den Chrysopras und die denselben begleitenden • • * i « fossilien in Schlesion. Ein mineralogischer Versuch von Job. Ludw. George Meinecke ; Erlangen, 1805.” Third /