Part Ilf. 
285 
Of Gems. 
An AMETHYSTINE ROCK. The Gem kith its Name 
from the opinion of its being an Avmlet againft Drunken- 
nefs. This Rock, confifteth of angular pointed and contigu 
ous Cry ft ah 5 growing from both fides the Matrix , "in¬ 
wards, where their Points meet,and are all clofely indented. 
Some of them feem to be Pentagonal. Several are Cotiicft 
from the Points towards the Roots. Thefe are well 
tinctur’d, but the Roots are all white, or rather Diaphanous 
and colourlefs. As alfo is the Matrix , or inward part of it; 
yet not fo clear. The (hell over all, flat, opacous, and of a 
redifh brown. There is the Figure of a very fair one in 
Calceolarius s Muf 
ANOTHER,growing upon a Matrix ox Bed fpotted red 
and yellow, and crofs-graind, or compofed of fmall 
Cry ft ah fet together decujfatim. 
A THIRD, the Matrix whereof is a kind of Amethyfttine 
Flint, i. e. not compofed of Cryftals or Grains, as is ufual, 
but one entire mafly Stone, Semiperfpicuous, and of a pale 
blew, almoft of the colour of fome Cows Horns. Of an 
orbicular Figure, and fomewhat flat like a Loaf. The 
Roots of the Cryftals are colourlefs, as in the former, and 
the points and upper parts of a pale Purple. With thefe, is 
included in the fame Matrix, a whitiih and flaky Stone, 
which is eafily diflolved with Spirit of Nitre. Which is 
one, amongft" many mllances, how near together two 
Stones may be bred, of fo different a nature one from 
another. 
A WHITE AMETHYST. This is here naked, or with¬ 
out a Matrix. Confifteth of divers contiguous Cryftals, 
half an inch and an inch long ; their Roots grey 5 but 
their Points clear, ufually fexangular. From the Points the 
Roots taper’d or conick : the Figure which doth efpecially 
diftinguilh this Stone from Cryftal, whether white, or ot an 
Amethyftine colour. 
An AMETF 1 YST of a pale Violet colour 5 found grow¬ 
ing m Scotland. Given by Sir Rob. Moray. 
ANOTHER, with a kind of Chryfolite growing to it. 
The beftof this kind, are, as Fheophraftws well deferibes 
them, of the colour of a ripe (red) Grape : and are the 
hardeft. Thefe grow in the Indies : the reft in Bohemia j (a) Boet. 4e 
Saxony, isre. The beft, being burnt, excellently imitate a ^; ni - & 
Diamond. ( a ) Two 
