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Corundum ruby sapphire
Corundum ruby sapphire













corundum ruby sapphire

The Royal Society will perceive, in the detail given by Mr. Ch e n e v ix, whose chemical labours are so useful to mineralogy, by his constant application of them to that science, to have the kindness to join with me in the investigation I had undertaken. I there­ fore chose, from among the specimens of corundum which had been sent from China, from the kingdom of Ava, from the Carnatic, and from the coast of Malabar, such pieces as ap­peared to me the most pure and, after having added to them a quantity of oriental rubies and sapphires, sufficient for many repeated analyses, I requested Mr.

corundum ruby sapphire

Mr, Klaproth indeed had already published an analysis of the corundum stone, and of the sapphire but he had not submitted to the same scrutiny, the perfect red corundum or oriental ruby it is possible also, that the specimens of corundum he made use of in his analysis, which had been taken from among the first specimens of this stone sent from India, were not so pure as might have been wished, and that this impurity was the cause of the difference, (which however was very trifling,) between the result of their analysis and that of the sapphire. The spe­cimens of corundum that have been lately sent from India, joined to the very considerable collection of oriental gems, in their perfect crystalline forms, which I have been able to pro­cure, have afforded me the most satisfactory demonstration that a mineralogist can wish for and nothing was now wanting to fix, in a complete and decisive manner, the general opinion respecting this stone, except to give it that additional support which is furnished by chemical investigation. power, which could conduce to the end I had in view and I may say, that my success has far surpassed my expectations. Since that time, I have never lost sight of this object, nor have I neglected any means in my. This opinion was founded upon circumstances which appeared to me perfectly satisfactory but these circumstances had not yet been sufficiently examined, nor were they sufficiently striking, to obviate every possible objection and, consequently, my opinion was not yet in a state fit to be presented to the Royal Society, as an established truth. Greville, had already formed, namely, that the said stone was absolutely of the same nature with those stones or gems which mineralogists, following the example of the jewellers, had hitherto distinguished by the epithet oriental. Greville, a Paper on the Corundum Stone, I gave some hints of an opinion which l,as well as Mr. When, in the year 1798, I presented to the Royal Society, in conjunction with Mr.















Corundum ruby sapphire