OF CORNWALL. „ 5 
before, this art feems to hare expired of itfelf, becaufe the manu- 
failure was of no longer ule. 
Here, as fitter to be ranged among ftones of curiofity, than to sect.ix. 
have a p^ace among thofe of ule or profit, I cannot pafs by unnoted Small gems 
the beautiful gems which we find fometimes among the tin grains, 
a though they are fo final 1, that, to be viewed properly, they require 
the afiifitance of the microfcope ; but they are not the lefs perfect, 
being as true gems, and of as high a ludre, as thofe that are larger. 
N . i. Among the tin grains found in Gofs-moor, in the parilh 
Oi St. Columb, and thole found in St. Audel-moor, I have found 
topazes very high-coloured, and fome of a paler yellow gold-colour, 
very tranfparent, fome zoned, about the twentieth of an inch dia- 
meter. 
N °* S °me rubies alfo I have found pebbly formed, fome lio-ht, 
and lome of as flrong red as a carbuncle. 
N°. iii. Some of the ruby kind are mixed with yellow, and may 
therefore be ranged among the hyacinths. 
N°. iv. A very finall chryfolite of a very dark-green with a tran- 
Iparency of yellow. 
N . v. A very deep amethyft, pebbly formed, of the fifteenth of Coloured 
an inch. We have alfo hexagonal crydals of the amethyftine kind, cryftak 
tinged drongly with purple, from our mines, fometimes an inch and 
more long ; but the fined ludre of this kind which I have yet feen 
in the Cornilh done, is incloled in the body of the Folrudon done ", 
where the fpaiks are the tenth of an inch long and under; but 
whether thefe are fo hard as to deferve the name of gems, I am 
not diffidently fatisfied. 
All thefe are fo fmall, that (it may be faid) they are of no va- 
lue, which is very true; but my enquiries (unfuccefsful I own in 
many particulars) I fhall not think entirely fruitlefs, if they can 
bin point out the way to farther and more happy dilcoveries ; thele 
finall Iparks prove that fuch gems are to be found among our tin- 
ores : it may not be unworthy therefore the attention of my coun- 
trymen carefully to infped the tin-grains of the fmaller fize found 
m dream-works, wherein they will probably find much larg er than 
what I have here deferibed, and fuch as may well compenfate the 
labour of feeking. 
N . vi. One crydal I have coloured with the fame brown and of 
as fine a ludre as the Kerry dones of Ireland, but of a much deeper 
tinge, and, as I take it, of the Beryl-crydal kind w . 
" See before-mentioned page, 96. - See Hill’s Foffils, page 178. 
N°. vii. What 
