mineralogy.^ 
There is in Europe great quantities of 
moft varieties of agates ^5 particularly at 
Oberftein in the Palatinate, where they 
are cut and polilhed : but they are like- 
wife found in every part of the world. 
In Sweden there is not yet, as far as I 
know, more than one fpecies of agate 
found *5 namely, at Gafebeck, in the pro- 
vince of Skone, which is of a white and 
deep red colour. 
SECT. LXIL 
8. Common Flint, Sikx communis Pyroma’^ 
thus. 
Is really of the fame fubftance as the 
agate , but as the colours are not fo ftriking 
^ I have lately got a fpecimen of a hollow agate ball, with 
pale am^thifts in the in fide, between which is cryllallifed a 
calcareous fubftance into a fibrous form. Thefe fibres are 
parallel, white, fhining, and very minute, exadly refembling 
the fineft afbeft, for which it alfo might be miftaken, if it was 
to be judged only by the eye. But by experiment it is found 
neither to be an aibeftus nor a gypfum, which fometimes 
ftioot alfo into a fibrous form, but entirely a pure calcareous 
fubftance. The whole mafs does not adhere together, but 
is nearly divided into fmall triangles, w'hich are placed upon 
one another, fo as almoft to form a large figure of the fame 
kind. Thefe fibres however, although very minute, may be 
found by means of a proper manifying-glafs, to be of an 
angular figure, like thofe mentioned in the note at page 82. 
The ftiape of balls and irregular nodules, is the moft general 
form in which agates and flints are commonly found. Neverthe- 
lefs, befides what I have feen in feveral collcdions in London 
and abroad, I have like wife fome fpecimens of native filver, 
from Potofi^in the Spanifti Weft Indies, which run in a grey 
and blue tranfparent agate, with white opaque veins ; which 
feems to confirm the opinion, that agates may form veins in 
the rocks, as well as other forts of ftones. [See the note of 
Sea. LXIIL] E. 
