The Lapis Lyncurius of the ancients was our Jacinth or Hyacinth. See Beckmann, and De Laet, ‘de gemmis.’ Dioscorides recommends it in affections of the stomach and bowels. (ii, 100.) Serapion describes minutely the Lapis iacinctus, or hyacinth, but merely mentions of it that it was used as a seal to avert the thunderbolt. (c. 398.) The stone which he describes in the following chapter, would appear decidedly to be the Tourmaline. He calls it Lapis rubeus, seu, hager albuzedi. Used as a seal, he says it dispels bad dreams.
The Cos is composed of a schistose argil. The Cos Olearia would appear to have derived its name from requiring the use of oil to answer the purpose of whetstone. See Pliny (H. N. xxxvi, 47.)
It is impossible to determine accurately the nature of the Hieracites. Aëtius, who has given the fullest account of it, describes it as a darkish green stone.
The Indian-stone would seem to be identical with the Arabian-stone. Rhases (Cont. l. ult. 401.)
The Lydian-stone is ranked by Dr. Thomson as a sub-species of Flint-slate. He remarks that it was used as a touchstone by the ancients.
The Ætites, or Eagle-stone, is a species of oxide of iron. Dr. Hill remarks that custom has given the name of ætites to every fossil that has a loose nucleus within it. The ancients used it very frequently as an amulet and incantation. See particularly Dioscorides and Aëtius. The Arabians also confirm, in the strongest terms, the imaginary efficacy of the Eagle-stone when used as an amulet. That it accelerated the delivery of woman in tedious labours, Serapion and Rhases declare, from ample experience, and that it would produce this beneficial effect on those who had faith in it we can readily believe. Indeed, we have often regretted that such innocent modes of working upon the imagination of women in labour had given place to more dangerous methods of practice in such cases. The Eagle-stone was retained in the English Dispensatory with all its ancient characters as late as Quincy. (165.)
The Thyites, according to Fuchsius, was a Turquoise; but Matthiolus is of a different opinion. Sprengel thinks it may have been a species of turquoise, although not the common one. Dr. Hill says it contains a small quantity of copper, which rendered it a valuable ingredient in collyria. It is prescribed for this purpose by Dioscorides. (v, 153.)
The Amiantus is composed of talc, calcareous and siliceous earth, clay, and a small proportion of iron. It is often confounded with the Alumen plumosum of the ancients, to which it is compared by Dioscorides. He does not mention any medicinal use to which it was applied, but merely states of it that it was used for forming the linum asbestinum. (v, 155.) See further Harduin in Plin. H. N. (xxxvi, 31.)
The Sapphirus of the ancients is supposed by Beckmann to have been the Lapis lazuli. (History of Inventions.) This opinion is now pretty generally established, and yet there is a difficulty attending it; for the Arabians, in treating of the Lapis lazuli, do not quote the descriptions of the sapphirus given by Dioscorides and Galen, but apparently refer to the cyanus. Dioscorides recommends the sapphirus as an alexipharmic, and a remedy for internal ulcerations and diseases of the eyes. (v, 156.) Galen merely recommends it as an antidote to the stings of scorpions. Rhases, under the head of “Lapis lazuli,” quotes Dioscorides as saying of it that it promotes the growth of the eyelashes, that it restrains fungous flesh, is septic, caustic, and ulcerative; and Galen, as saying of it, that it has abstergent powers, with a moderate degree of attenuating and styptic virtues; that it may be mixed in collyria for the eyes, and especially for the eyelids when affected with sharp humours, which it represses, and also prevents the growth of the hairs. (Cont. l. ult. i, 404.) See also Serapion (c. 389); Averrhoes (Collig. v, 43); and Haly Abbas (Pract. ii, 45.)
The Calais of Pliny and the ancients is said by Dr. Hill to be the Turquoise, or Gemma Turcica, which consists principally of lime and iron. See the Thyites.