Corundum Stone from Asia . 419 
required, to ascertain the analogy or identity of the sapphire 
and Oriental ruby with Corundum, 
I have before stated, that I have Corundum (which has the 
same texture and fracture as the common colourless Corun- 
dum) of a ruby red, and also of sapphire blue, and of sapphire 
blue and white colours. 
I have sapphires, yellow and blue, white and blue, brown and 
greenish, and of a purplish hue; these I should consider as 
Corundum, with fracture of vitreous lustre. 
Mr. Tranckell, who resides in Ceylon, and from whose 
communications I derived lately much information, had, about 
five years ago, a sapphire, the greater part blue, and the remain- 
der of a pale ruby colour. I saw, in Rome' de i/Isle's collec- 
tion, at Paris, a small gem, which was yellow, blue, and red, 
in distinct spots, and he called it Oriental ruby. M. de la 
Metherie, to avoid the confusion of the denomination Oriental 
ruby with octoedral ruby, calls it a sapphire ; with more cor- 
rectness, I think, the abovemention ed gems should be classed 
as argillaceous, under the denomination of Corundum. 
I am not uninformed that Corundum is said to be found in 
France. The Count de Bournon is convinced, that the spe- 
cimens mentioned in Crell’s Journal, as having been found 
by him in a granite in the Forez, were Corundum. M. Mor- 
veau also says, he found it in Bretagne ; but the Abb6 Hauy, 
in No. 28 of the Journal des Mines, asserts, that the Corundum 
found in France is titanite : he does not say whether this ob- 
servation extends both to the Corundum of Bretagne and that 
of the Forez. 
In the same manner I had observed, in the specimens 
which Mr. Raspe called Jade, or a new substance, from Tiree, 
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