Page:Theophrastus - History of Stones - Hill (1774).djvu/159

 in like manner, the Female of which is more tranparent, and of a paler yellow; and the The Carnelian and Lapis Lyncurius have been poken of already. The Gem which the Antients called Cyanus, is what we now know by the Name of Lapis Lazuli; a Stone common among us in the Tops of Snuff-boxes and other Toys; and of which the glorious blue Colour, called Ultramarine by the Painters, is made. This has alo been already treated of occaionally in the Notes on the Sapphire. To what is there aid, it may be not improper to add, that it is a true Copper Ore, generally yielding about ⅛ of that Metal, and commonly a little Silver: It is of two Kinds, the Oriental, and German; the former is from Aia, Africa, and the Eat Indies; the Colour produced from this is not ubject to Injuries, from Time or any other Accidents: The German is found not only in the Kingdom whoe Name it bears, but in Spain, Italy, and Saxony alo; in Mines of different Metals, particularly of Copper. The Colour made from this is ubject to Injuries from many Accidents, and in Time uually turns green. The Stone, whereever found, is generally of the ame Figure and Complexion, excepting, that the Oriental is harder than the other Kinds. It is compoed always of three Subtances, with which there is ometimes mixed a fourth, a Kind of Marchaite, of a hining yellow Colour, and flying off in the Calcination with a ulphureous Smell, like that of the common Pyritæ; the other three Subtances, of which it is contantly compoed, are hard, fine crytalline Matter, aturated with Particles of Copper, and by them tained to a beautiful deep blue: This is what may be called the Bais, and is variegated with a white crytalline Matter, and a yellow Talc of the foliaceous Kind; but the Flakes of it are o mall, that the Whole appears in the Form of a Powder. Lapis Cyanus is in the ame manner divided into Male and Female; the Male is in this alo of the deeper Colour.

LVII. There is alo the Onyx, variegated with white and brown placed