MINERALOGY. 2 3 



8. 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. 



g. Being thus decompounded, the calx or 

 earth which is left, mews commonly fome 

 marks of iron. 



SECT. XIV. 



The Gypfeous earth is found 



i . Loofe and Friable, 'Terra Gypfea pulverulen-* 

 ta. Gypfeous Earth, properly ib called, 



Guhr. 



a. White, is found in Saxony. 



SECT. XV. 



t. Indurated, 'Terra Gypfea indurata. 



A. Solid, or of no viiible particles, Solida 

 particulis impalpabilibus, Alabafter, Ala- 

 bafirum. 



This (tone 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. 



i. Clear and tranfparent, from Perfia. 



2. Opaque, from Italy, and Trapanoia 

 Sicily. 

 I. Yellow. 



brrax, the glafs becomes opaque, juft as it happens w'th the 

 pure iimsitcrie. See the following Treatifw oa the Pocket 

 laboratory, Seel, xxviii, 



C4 i. Tranf- 



