284 Of gems. Part III. 
A THIRD, growing upon a Bed of the fame colour 5 
( a ) Of Gems, but opacous. - Mr. Boyle (a) mentions a piece o( Cryftal, in 
ci) 3 Muf. one part of aiiEmrald-green. And Ter^agi (b) another that 
Sept, was black. 
A Crftyal COLUMN, naturally inclofinga kindofMofs 
( or the likenefs of it ) at one end of the Column of a paler, 
at the other of a dark Green. Tis above ? a foot in compafs. 
ANOTHER piece of CRYSTAL in which is immerfed 
a Mofify fubftance of a redifh colour. And there are fome 
Cryftals have been known naturally to enclofe a Li- 
re) m.Boyk, quor. (V) 
oj Gems^ A Piece of polifh'd CRYSTAL in the figure of a half 
Muf/Caic. Globe. 'Tisonone fide flaky, and hath many very fmall 
Bubles, by which it appears cloudy. 
ANOTHER Piece polifti'd into a Spherical Triangle,and 
fome what Oval. 
A THIRD Piece polifh'd into a Cone. 
A Many Piece of CRYSTAL. Not pointed, nor an- 
gular 3 but of a roundifh figure $ much bigger than any 
mans head. One way, near a yard in compafs 5 the other, 
above three quarters. In weight, thirty nine pounds and a 
i Haver dupoife. Yet is it very clear, beyond the cleareft 
Ice of the fame thicknefs. The biggeft piece of Cryftal I 
find mention d elfe-where, is a Ball of fix and thirty ounces 
in Septalims Mufaum. 
Cryftal, at leaft fome forts of it, is the fofteft, faith Boe- 
c^)Lib. 2. tins, (d)o£ all Gems. Hefhouldhave faid, of all perfpi- 
c. 73.1. 1. cuous Gems : for the Turcot* is much fofter. The molt 
fOMuf.Sep- ufual Figure of Cryftal, is Sexangular: yet Ter^agi (<?) 
ni.c p.n.54. mentions a Rock of fquare pointed ones. But it is obfer- 
vable, That he faith the Bed on which they grew, feem'd to 
be Gold-Ore. If fo, it might proceed from fome govern- 
ing principle in the Ore. For I have heard it noted, as I re- 
remember, by Sir Chriftopher Wren, That G rain-Gold is of- 
ten found naturally figur'd into Cubes. Cryftal grows in 
moft Countries, both cold and hot : the Globous, efpecially 
in Bohemia and Silecia. 
A Drachm (/) of the Powder of Cryftal, with Oil of 
alnJkL* ^ wcet ^ mon ds , a prefent Remedy for thofe that have 
lib. 2. c.74. taken fublimate. As alfo for bilious and chylous Diarrheas. 
( (l]\tu i (g) When Calcind, by fome called Puhk Claris, of ex- 
h Muf. Sept. cellent ufe againft the Epilepfte. (/>) An 
