Page:Theophrastus - History of Stones - Hill (1774).djvu/302

 12.—Blue green Sapphire, called Aqua Marine.

Sapphire, coloured by Copper and Lead.

13.—Yellow green Sapphire, called Chryolite:

Sapphire coloured by Copper and more Lead.

14.—Coare green Sapphire,called Praius.

Sapphire coloured by Copper and Manganee.

Thee are the Oriental Gems.

They are all found in pebble or columnar Forms; ingly and in Cluters; and of different Bignees.

There are alo Crytals of thee Colours, which are called occidental Gems of the ame Names.

We know the Ingredients which give their Colour, by Experiments in colouring Glas and Pates.

Thee with the Colour give no Addition of Weight.

There is beide all thee a debaed Sapphire, fouled by Earth.