Of Regular Stoner. 
Part III. 
3 io 
in a like manner, but differently contiguous 5 fo, as in fomc 
places, feveral Plates may make but one Refract ion ; in 
others, two or more. It was dug out of a very high 
Mountain in If and, one whole fide whereof confiffeth of 
this Spar. 
TWO PIECES of the fame Stone, about two inches and 
v long, broad, and thick. Thus far of Rhomboid Stones. 
The RHOMBICK LEAD-SPAR. Frequently found 
in the Lead-Mines in Derbyjbire, and in others. By fomc 
called Englijh Tall. But very improperly. For though 
it confiffeth of feveral Plates , yet not flexible, but brittle as 
Glafs. Befides, his not of a Rhomboid, but Rhombiek 
Figure, that is, a Diamond-fquare, or with the Angles un¬ 
equal, the fades equal. Nor doth Talk, feel any Acid, but 
this with Spirit of Nitre is eafily diffolyed. It breaks into 
pieces, which, though never fo fmall, yet retain the fame 
Figure. Being burned, it yieldeth a Lixivial Salt. 
A clear FLINT, of the colour of yellow Amber , with 
Striae on the fides fhaped into little Rhombes. 
A RHOMB of MUSCOVY-GLASS. This Stone is 
by moft called Selenites. By fome Maria Glacies. By 
i Aldrov. Agricola, and Kent man. Magnetic. By' Ambrofinm, ( a) con- 
' uf,Meta11, founded, under the fame Name, with Talk, Tis indeed 
the neareft of kin to that of any Stone, being infenfible of 
Acids 5 and confiding of very thin, perfpicuous, gloffy, 
parallel, and flexible Plates. Seldom found figur’d. But 
when it is, I fuppofe always, as it is here in this piece, fc. into 
a Diamond-fquare, i. e. with unequal Angles, and equal 
fides 5 whereas in a TalfCryftal, both are unequal. It was 
taken out of Mount Hamm. 
A very white Piece of Mufcovy-Glafs. 
ANOTHER,of a pale Green colour, with a kind of filver 
glofs, and femiperfpicuous. 
Another, of the colour of tarmfh’d Copper mixed with 
black. 
A lump of Selenites. ’Tis immerfed in fmall pieces in 
a whitifh Stone, a little Diaphanous, and fo hard as to cut 
Glafs. 
This Stone grows in Cyprus, Sicily, Saxony, and many 
other places 5 efpecially in Mufcovy, whence the Englijh 
Name. Ufed in Saxony, and other places in Germany, in 
Windows, 
