290 Of Gems. Part III* 
caufeth thofe Refractions. Tin and Venk-Glafs melted to- 
00 Porta, gether, imitate an Opalus. (a) See alfo the Phil. Tranf. 
(b) Num.38, hereof, (b) 
The ONYCOPALUS. By fome called Oculus Cati. It 
hath the Zones or Rings of the Onyx, of a pale White. The 
beft of thefe are found in Zeilan and Pegu, Much harder 
than the Of aim. It might be tryd, whether this Stone doth 
in any degree partake of the ftrange property of the Opalus 3 
fome of which, being only fteeped a while in common 
£' > ra aet,ubi water > will become Transparent for fome time, (c) 
The CALCEDONY, L e. Onyx Chalcedonius, as Kentman 
(d) Foffii. not amifs. (d) This is polifh'd and fet in a Frame. Above 
omcnc. four inches long, and near as broad. Semiperfpicuous, al- 
moft like to a piece of grey Ice. Confifting of white and 
moft 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 
cleareft, with a pale caft of blew the beft. In Germany, be- 
ing cut into thin broad Tablets , many have their Arms 
either engraven thereon, or painted on the back-fide 5 pre- 
fering it to Cryftal, as being harder, if good. Hereof alfo 
are made little Mortars for the powdering of Emery 5 like- 
(e) Georg. w ife Cups, Religious Beads, iSc. (e) 
A s»c The SARDIUS or Cornelian, qu. Cornelian. A femiper- 
fpicuous Stone. The beft, by fome called The Male, of the 
colour of Flefh, faith Boetim, with the blood in it. I add, 
but of a living Animal. But this is diluted with fomewhat 
of an Amber-colom. Anciently not only This, but all the 
(mailer Gems, were ufed efpecially for Signets and Signet- 
The SARDONYX. As it were compounded of the 
Sardius, and the Onyx. This is polifti'd, and fo the better 
Ihews it felf. It confifteth of White and Blackilh Rings, 
one with in another. And ftained both with red, and pale 
green Spots inter jeclred. The Rings, with the help of a Glafs, 
appear much more numerous, curioufly reprefenting thofe 
in the Root of Taraxacum or Dan-de-Lyon, cut tranfverily. 
Note alfo, That the faid Rings are properly fo call'd, only in 
the polifh'd Stone 5 being, when entire, really fo many Balls* 
as 
