538 Of Mineral Principles. Part III- 
Yellow Mundick GRAIN-ORE 5 immerfed in a Spar of 
an Amethyftine colour. 
Another fort, like Silver Grain-Ore, in a Spar of the co- 
lour of that of Tin. So hard as to cut Glafs. 
A piece of MundickOre in a white Spar, both Grained 
and Vein d. 
A piece or two of Veined Ore from a Silver-Mine. 
Mundick Ore and Vitriol mixed with a White and Green 
Spar. 
Mundick Ore, and Blac\ Daze , mixed with a Vein of 
White and Green Spar $ all lying between two firm Beds 
or Walls. Thefe Ores, by fome are called MockOres. 
A MOCK-FIRE-STONE. Pyrites fiirilis. Outwardly, 
of the colour of polifh'd Steel. And radiated from the 
Centre, as the true Pyrites. But of a light and ufelefs fub- 
fbnee. 
No fort of Mundick? that I find,either in the Ore, or per* 
feci, ftirreth with Acids. Every Metal hath its Marchafite : 
Lapid Ti^ w ' llcn ls fometimes added to them, inftead of Lead, (a) to 
(b) Dr.* make them flow the better. But if too much, it robs them, 
vaiiT ' S Tl> ky over volatilizing them (b) in the Furnace. Out of molt 
Fire ftones, may be made both Vitriol and Sidphur. 
SECT. lit 
Of <£\dineral 'Principler. 
Y Mineral Principles, I mean, neither fuch imaginary 
ones as fome have talked of : nor fuch as may poflibly 
have a real exigence, yet were never feen folitary or uncom- 
pounded : but thofe which come within the cognizance of 
fenfe, fc. Salt, Sulphurs, and Earths 5 and fuch Bodies as 
are reduceable to thefe Tribes. For it feemeth to me, That 
mod fubterranial Bodies are either compounded of 
thefe Three, or are hereinto refolved. So Copperas is the 
fait of a Metal $ either as an ingredient in its Generation 5 or 
rcfulting from its Corrofion by fome Natural Menjtruum 7 
equivalent to fuch as are apply ed by Art. In like manner, 
a Boluses it feems to be the Balis of moft Stones and Metals * 7 
