290 
Of Gems. 
ART 
lit 
(a) Porta. 
( b) Nuin. 38 , 
caufeth tliofc Retractions. Tin and Venis-Glafs melted to¬ 
gether, imitate an Opalus. (a) See alfo the Phil. Tranf. 
fnpra. 
(d) Foffil. 
Nomcncl. 
hereof. (b) 
The ONYCOFALUS. By fome called 0 cuius Cati. It 
hath the Zones or Rings of the Onyx, of a pale White. The 
bed of thefe are found in Zeilan and Pegu. Much harder 
than the Opalus. It might be try’d, whether this Stone doth 
in any degree partake of the ftrange property of the Opalus • 
fome of which, being only fteeped a while in common 
2 ^ lct ’ ubi water, will become Tranf parent for fome time, (c) 
The CALCEDONY, i. e. Onyx Chalcedonius , as Kentman 
not amifs. id) This is polifh’d and fet in a Frame. Above 
four inches long, and near as broad. Semiperfpicuous, al- 
rnoft like to a piece of grey Ice. Confiding of white and 
moll perfpicuous parts fo mixed together,as to look in fome 
fort like a Honey-Coome. 
Another fmall one, with a pointed and fexangular polifh 
at both ends. 
This Stone is next in hardnefs to the German Agate. The 
cleared:, with a pale cad of blew the bed. In Germany , be¬ 
ing cut into thin broad Tablets , many have their Arms 
either engraven thereon, or painted on the back-fide; pre- 
fering it to Cryftal, as being harder, if good. Hereof alfo 
are made little Mortars for the powdering of Emery ; like- 
Wife Cups, Religious Beads, istc. (e) 
The SARDIUS or Cornelian, qu. Carnelian. Afemiper- 
fpicuous Stone. The bed, by fome called The Male, of the 
colour of Flefh, faith Boetiws, with the blood in it. I add, 
but of a living Animal. But this is diluted with fomewhat 
of an Amber- colour. Anciently not only This, but all the 
fmaller Gems, were ufed efpecially for Signets and Signet- 
k / LIi“ p - (/) . fl 
The SARDONYX. As it were compounded of the 
Sardius , and the Onyx. This is polifh’d, and fo the better 
fhews it felf. It confideth of White and Blackilh Rings, 
one with in another. And dained both with red, and pale 
green Spots interjected. The Rings , with the help of a Glajs, 
appear much more numerous, curioudy reprefenting thofe 
in the Root of Taraxacum or Ban-de-Lyon, cut tranfverdy. 
Note alfo, That the faid Rings are properly fo call’d, only in 
the pohfh’d Stone j being, when entire, really fo many Balls, 
0) Georg, 
Agric. 
as 
