Page:Theophrastus - History of Stones - Hill (1774).djvu/288

 peculiar Nature, and in particular o corroive that it diolves all Veels, in this State; jut as, mixed with the vitriolic Acid, it does the Glas of the Retort in the uual Ditillation. Mixed with crude Ores, it wonderfully promotes their Fuion.

A Degree of Fire ufficient to make the Stone red hot, detroys that phophoric Light it yields when gradually and gently warmed. Slowly heated, it is phophoric, as long as it continues warm: And it burns with a blue Flame without Smell. From thee invariable Characters it is plain, that it is neither Crytal, Spar, Talc, or Selenite; but a diftinct Genus of Foil from them all.

It is found green, yellow, white, blue, and violet coloured. The green and yellow are common in Sweden: There is a deep green in Saxony: The blue is frequent in China; and there is ome in Bohemia: The white and the violet-coloured we have in England.

The foile Bodies that approach nearet to its Nature, are the Swedih Zeolite; the Bolonian Phophorus Stone; and our Star upon the waxen Vein.

No one of all which Properties belong to this new Stone.

The Zeolite is phophoric, jut as it melts; And