Diamonds and precious stones, a popular account of gems .. . as exhibiting thetreasures, observed the act, and before the honestman departed persuaded him to take an emetic forthe benefit of his stomach. The gem was in thismanner immediately recovered. SECOND ZIRCON. The zircon, called also the jargon, is altogetherspecial in its composition, being formed of silica,united with a peculiar mineral—zircona, the oxideof zirconium. The zircon crystallizes in four-sided prisms, withvarious modifications. Fig. jj shows the primitiveform, and Fig. 78 a modification approaching theform of the
Diamonds and precious stones, a popular account of gems .. . as exhibiting thetreasures, observed the act, and before the honestman departed persuaded him to take an emetic forthe benefit of his stomach. The gem was in thismanner immediately recovered. SECOND ZIRCON. The zircon, called also the jargon, is altogetherspecial in its composition, being formed of silica,united with a peculiar mineral—zircona, the oxideof zirconium. The zircon crystallizes in four-sided prisms, withvarious modifications. Fig. jj shows the primitiveform, and Fig. 78 a modification approaching theform of the dodecahedron. Generally speaking, each of the two types has itsown particular colour, which is shared by the crys-tals belonging to it. The first is a brownish andgreenish-yellow, the second brownish-red. Wernercalled the rhomboidal type hyacinth^ and the pris-matic zircon. Ancient lapidaries made the same 1/2 PRECIOUS STONES. distinction, and the stone that Werner calls zirconis their jargon of Ceylon. The colourless crystals of the zircon are the most.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectgems, booksubjectprec
