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The mirror of stones; in which the nature, generation, properties, virtues and various species of more than 200 different jewels, are distinctly described. Also certain and infallible rules to know the good frim the bad ... Extracted from the works of Aristotle, Pliny, etc ... / by Camillus Leonardus ... ; Now first translated into English.

Camillo Leonardi

Date:: 1750

Credit: The mirror of stones; in which the nature, generation, properties, virtues and various species of more than 200 different jewels, are distinctly described. Also certain and infallible rules to know the good frim the bad ... Extracted from the works of Aristotle, Pliny, etc ... / by Camillus Leonardus ... ; Now first translated into English. Source: Wellcome Collection.

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fos] satiate: detebsaeitidt: eae 3 a i aE ou «Ma a eo o the Perfpicuity and Opacity of Stones, | and of their Colour. pErfpicuity, or Opacity,’ ‘octafion asin | Differences in Stones, fince by Means of chef) they may appear in the Colodis them» felves,’ as, according to the Philofopher, is held’ of ‘thé’ Senfe and’ Things fefifible 5 wheiy he. fays, ‘that Colour is the Extremity of the Perfpicuous in’ a terminate Body. 5 A's’ alfovby ‘ the» Comimehtator! 40entoes;* who? holdsy ‘that Colour ‘arifés front the-Commixe! ture of a lucid Body with a darko -There- fore: before weafcertain fome' Differences about, the Accidents in the ‘Colour of ‘Stones; ’ itis neéceflary to’ declare: in’ wha Wlatinice “Petfpicuity sor Opacity” Tiappens ‘in Stohes, _ and what one and the other really'is We’ affert then, that Perfpicuivyds the-imaterial Exiftence of a Stone with:a:Tranfparency, or. a kind of: Bughtnefs, and Opacity’ is accompanied with an Obfonriny/! ‘anid Denfity.” From) whence it:follows, that othap Stone is pérfpicuous.in whofe Matter themore Caufes of the Perfpictiotis concur;) as Firey Air, and eee and, by) epoca) we. fay. that: is

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