Copy 1, Volume 1

Travels in England, Scotland, and the Hebrides; undertaken for the purpose of examining the state of the arts, the sciences, natural history and manners, in Great Britain / Tr. from the French of B. Faujas Saint-Fond.

Barthélemy Faujas de Saint-Fond

Date:: 1799

Credit: Travels in England, Scotland, and the Hebrides; undertaken for the purpose of examining the state of the arts, the sciences, natural history and manners, in Great Britain / Tr. from the French of B. Faujas Saint-Fond. Source: Wellcome Collection.

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$Doctor Lind gave the Chinefe ftone the name of adamantine fpar, becaxfe its lamel- ~ 6. Idem, with white fteatites, foft and having 2 fmall mixture of mica, : 4. With rofecoloured felt fpar, 8. With ferruginous pyrites of a cubical form. 9: Cryftal, mixed with adamantine fpar, having on one of its fides an impreffion of a cubical pyrites. Sak à 10. Adamantine fpar, in large irregular particles, adhe- ring to like irregular particles of a reddifh soie quartz, and iron fcattered in fmall laminæ. : It cannot be any longer doubtful, that the adamantine {par exifts in a compound fubftance, Lametherie mentions the adamantine fpar in his notes on the fciagraphy of Berg- mann, p. 271, vol. 1, and, in imitation pf Klaproth, gives it the name of corrindon. This learned an@tetteemed friend, who feeks for truth only in all his enquiries, will not be has committed on the fubject of this ftone, where he fays, in {peaking of its hardnefs, “ that it equals only that of the & rock-cryfta] at moft, for rock-cryftal cuts it fooner than it © cuts the cryftal ; its hardnefs may, therefore, be confi- & dered as that of eleven to cryftal.” The following is a _ decifive anfwer upon that fubjet: it is a detailed account of the experiments which I caufed the fon of M. Fon- taine, one of the ableft lapidaries in Paris, to make in the prefence of M. Hoppe, a German, who is deeply verfed in the knowledge of precious ftones. This fubject is of fuf- ficient importance, from its novelty and utility, to juftify my introducing in this place the refalt of thefe experiments. & M. Faujas (Saint Fond) having {ent to M. Hoppe a # certain quantity of adamantine fpar, to make compara- Es$