The 3\(amral Bi/lorj 
alburn^ as isfaid by the fame Kentmannu6^ Efflorefcere ^ fyrite Gof- 
lariano^ isf Radehergenfi^, 
13. Next to thefe, in order of nature as Bellas dignity, comes 
the filver Marchafite under confideration, of a white gliftering 
colour, and to be had in the bottom of the River between Clif- 
ton and Burcot : thisftrikes fire as well as the golden Pyrites^ but 
notwithftanding it was expofed in the fitteft places, yet would 
never, that 1 could perceive, fend forth any efflorefcence. An* 
other fort of them I met with at Veddington^ taken out of the 
afore-mentioned ywZ/Z'Mr Well there, of as glorious a colour as 
the former ; but feveral times tryed on the bell Steel I could get, 
would never yield the leaft fpark of fire : whence I rather con- 
eluded It to he argent umfe Hum ^ or Cat -filver^ but that it would 
notdiine in the dark^ or confume in the fire : However, it may 
pafs for a sterile nitidum^ fo often mentioned by Naturalijis^ it 
being a glorious ;zo/feg, of no kind of ufe. 
14. Th?it Flints^ Pebbles^ zndSands^ are alfo Pjrz/e^, needs 
no further evidence than that they ftrike fire, a thing fo obvious 
to the meaneft Obferver, that to fpend time to prove it, would 
be loft time to the Reader ; itfliall fuffice therefore to enumerate 
the feveral kinds of each, and chiefly to infift upon fuch as have 
ufes, 
15. All along the Chiltern Country of Oxford-JJnre^ Flints 
areas plentiful as any where clfe ; amorigft them the black one, 
wellpolifti'd, will fupply the place of the Lydian Jlont ; and at 
Uenly they ufe them in making of Glafs, of which more anon in 
the Chapter of Arts, They are found befide of divers other co- 
lours, and fome of them fo tranffarent^ that they feem not only 
to imitate, but to be the very fame with Achats, I have one, 
fomd 21 D or chejler, about an inch and half fquare, of zflefi co- 
lour^ and fo tran/parent^ that k may well enough deferve the 
name of Sardachates, Such as this were alfo (hewn me, by the 
truly Ingenious, the Right Konoidhle^ames Lord Norreys of Pi- 
cot, and found, as I think his Lordfhip told me, fome where 
thereabout, and are I do not qucftion the very fame ftones, that 
J(entmannu6 ^ indeed places in his Title of Flints^ yet calls them^ 
Pellucentes Sard<£ colore, 
16. Of Pebbles there are fome alfo tran(parent^ to be had a- 
* T/f.2-cap. Sorp ^ dejucckeffiorefcent. a Kenpnan. tit'%, 
\ bout 
