Diamonds and precious stones, a popular account of gems .. . are placed quartz or rock cry-stal, and all its varieties. The latter bear verydifferent names in commerce, but their compositionis almost identically the same. If a piece of whitesilk were cut into shreds, and each of these piecesplunged into a dye of different tint and intensity,a different name might easily be given to eachfragment according to its colour ; but its substancewould still be the same. Quartz holds the samerelation to the precious stones of the section weare about to consider, as the white silk would bearto the tinted
Diamonds and precious stones, a popular account of gems .. . are placed quartz or rock cry-stal, and all its varieties. The latter bear verydifferent names in commerce, but their compositionis almost identically the same. If a piece of whitesilk were cut into shreds, and each of these piecesplunged into a dye of different tint and intensity,a different name might easily be given to eachfragment according to its colour ; but its substancewould still be the same. Quartz holds the samerelation to the precious stones of the section weare about to consider, as the white silk would bearto the tinted morsels we have described. FIRST Quartz, which is called also rock crystal, is one of 148 PRECIOUS STONES. the substances most frequently occurring upon thesurface of the earth, and probably also in its interior. It forms, says an English writer, about one-third of the mass of those immovable hills whosesummits pierce the clouds, and nearly the whole ofthe mobile soil of the trackless desert rolling withthe wind like the waves of the
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectgems, booksubjectprec
