506 Of Regular Stones. Part III. 
Tophus. Tis of a brown colour, porous light and friable, 
as a Pumice. And perforated with many Pores more con- 
fpicuous, about as big as to admit a large Pin, and regular, 
fc. round, ftrait and fiftular. 
I now proceed to feveral Spars 5 of which, although 
(ome belong to Metals 3 yet here, have no Metal adhering 
to them. Thofe that have, will fall in amongft Ores. And 
firft of fuch as are pointed, both foft and hard, referving the 
Flaked for their place. 
Let it only firft be noted, That the fpecifick difference 
betwixt the Stalatlifes and the Spar, is, That the former, is 
always Opacous, and never Angular : the latter, always or 
ufually perfpicuous, and never round. 
A Silver-Ore SPAR. About an inch and * high, and three 
in compafs. It confifteth of feveral Ojr/fo/sfexangular and 
pointed, and compofed into the figure of a great Bud. The 
four uppermoft bigger than the reft. All femiperfpicu- 
ous, of the colour of grey Chryftal 3 and feem to be as 
hard. 
ANOTHER large Piece confifting of hard and fexan- 
gular Cryftals, and of the fame colour with the former. 
Taken from the Coginnian Silver-Mines. Given by 
Mr. Cokprefs. 
Several other Pieces of the fame, and given by the fame 
1 A METALLICK SPAR , of a pale AMETHYSTINE 
colour. 'Tis angular and pointed, as Cryftal 3 but with fides 
more unequal. 'Tis alfo foft and brittle. Yet harder than 
" fome others. And hath no fenfe of Acids. 
A SHOD. Spuma Lupi. The forerunner of the Load 
or Mother of the Tin-Ore. 'Tis both blacker, and harder 
than the Mother-Spar. 
Another of the fame , mixed of black , grey , and 
yellow. 
The MOTHER-SPAR of the Tin-Ore. 
ANOTHER, arifingfroma Whitifh Bed, mixed with 
a kind of rufty red. The Cryftals are angular, pointed, and 
foft, like the fquare Lead-Spar. Semiperfpicuous,yet moitly 
cover d with an angular and blackifti (hell. 
A pretty hard Aih-colour d and Opacuous 5^r,growing 
near the Tin-Mines. 
A 
