Lapis Armenus
The lapis Armenus was well known to the Arabs under the name hajer Armeny, and their medical writers describe it quite accurately and distinguish it from the somewhat similar lapis lazuli, with which it was often confused in ancient times. Ibn Beithar states that if properly prepared it would not provoke nausea, as was otherwise the case. It was said to cause a very abundant evacuation of bile and must have been regarded as an efficient remedy for the bilious disorders so general in warm climates.[[296]]
A “blue amulet” against vertigo, melancholia and epilepsy could be made up of the following ingredients: shavings from an elk’s horn and from a human skull, to be reduced to a fine powder, the excrement of a peacock, white agate, lapis lazuli or lapis Armenus, of which enough was to be used to give the required sky-blue tint. The whole mass was then to be softened by the addition of gum tragacanth, and formed into heart-shaped tablets, which were to be dried out in the air, and then smoothed on a turning-lathe. These amulets were to be worn attached to the neck or the arm, sometimes they were enclosed in a little receptacle of silver or of red sandal-wood and suspended from the neck.[[297]]