33% 
Of Mineral Principles . Part III. 
Yellow Mundick. GRAIN-ORE ; 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 MundickzOre in a white Spar, both Grained 
and Vcin’d. 
A piece or two of Veined Ore from a Silver-Mine. 
MundickzOre and Vitriol mixed with a White and Green 
Spar. 
MundickzOre, and Blacky Daze , mixed with a Vein of 
White and Green Spar ; all lying between two firm Beds 
or Walls. Thefe Ores, by fome are called MockcOres. 
A MOCK-FIRE-STONE. Pyrites jiirilis. Outwardly, 
of the colour of polifh’d Steel. And radiated from the 
Centre, as the true Pyrites. But of a light and ufelefs fub- 
ftance. 
No fort of Mundick., that I find,either in the Ore, or per¬ 
fect, ftirreth with Acids-. Every Metal hath its Marcbajite : 
Lapid °i Ct 2 de w h* c h 1S fometimes added to them, inftead of Lead, (a) to 
(h) Dr. make them flow the better. But if too much, it roos tbem, 
i’s Tra- by over volatilizing them (b) in the Furnace. Out of molt 
Fire-ftones, may be made both Vitriol and Sulphur. 
Brorvn 
vails. 
SECT. III. 
Of SVLineral ‘Principles. 
B 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 j either as an ingredient in its Generation 5 or 
refulting from its Corrofion by fome Natural Menjtruum, 
equivalent to fuch as are applyed by Art. In like manner, 
a Bolus ,as it feems to be the Bafis of moft Stones and Metals $ 
fo, 
