MINERALOGY. 
21 - 
S. Burnt with, a phlogifton, it fmells of ful- 
phur, and may as well by that means, as 
by both the alcaline falts, be decompound- 
ed ; but for this purpofe there ought to 
be five or fix times as much weight of fait 
as of gypfum. 
Being thus decompounded, the calx or 
earth which is left, fhews commonly fome 
marks of iron. 
SECT. XIV. 
The Gypfeous earth is found 
1. I^oofe and Friable, "l^erra Gypfea pulverulen-^ 
ta, Gypfeous Earth, properly fo calked, 
Guhr, • ' 
a. White, is found in Saxony. 
SECT. XV. 
2. Indurated, Terra Gypfea Murat a, 
yf. Solid, or of no vitible particles, Solida 
particulis impalpahilibus. Alabafter, Ala- 
hafirum. 
This flone is very eafy to faw and cut, 
and takes a dull polifh. It is not 'always 
found fatiated with the acid of vitriol. 
White, alabafter. 
1. Clear and tranfparent, from PeiTia. 
2. Opaque, from Italy, and Trapanoin 
Sicily. 
I, Yellow. 
borax, the glafs becomes opaque, juft as it happens w'th the 
pure Umeftone. See the following Treatife on the Pocket 
Laboratory, Sed. xxviii. 
C4 I. Tranf- 
