Volltext Seite (XML)
io8 FLINT GENUS. Ufe. The colour which characterifes this foflil is tremely pleafing ; the eye, after viewing the beautifoj colours of the fapphire, oriental ruby, fpinelle an topaz, repofes with delight on the frefh and animating colour of the emerald, the charming emblem of ^ vegetable kingdom ! It is rare, however, to find tb e colour pure and of good ftrength, hence fuch fp# 1 ' mens are very highly valued, and are employed > n the mod expenfive kinds of jewellery. Obfervations. i. Emerald and beryll have a drong refeinbl^ to each other ; thus both are green, their cryfta 1 tion differs but little, and fra&ure, hardnefs => weight are nearly the fame. Notwithdanding | agreements, Werner confiders them as well di guifhed from each other by the following chai , a^ c Emerald occurs only green, but beryll befules g' is alfo yellow and blue ; the crydals of beryll are j thofe of emerald are fliort; the lateral planes of e are dreaked, thofe of emerald are fmooth ; minal planes of beryll are fmooth, thofe of el1 5) are rough; beryll often prefents didincl concret ra ci' emerald never ; beryll often fliews a formation ^ jj cular fhoots, emerald never; beryll has tran rents, emerald never.