I02 



EARTHS. CALCAREOUS. 25. Gypnmi. 



25. GYPSUM. Confiding of carbonate of Yum 

 linked to fulphuric acid: light, very ioft, a little 

 frigid : not coiniiaonly ef^ervelcing with nitric 

 acid, melting with difficulty in the fire, biiteafily 

 crumbling to powder, which caiiies no ebullition 

 in water but forms a pafte hardening and diftend- 

 ing by expofure to the air. 



$errcuj2i. J'owdery, of a white colour. 



Calx. Gur. Sy}. nat,KU, 3. p. 207. ji 6. 



Farinr-ccou? Gypfum. Ki>''ViMn miner, i, /, \io. 



Gypfcous earth.' SchmeJJer mher. i. p. 240, 



Earthy Gypfam. Ihomfm chem. 3. p. 61 ij. 



Found in the fiffurcs ol gypleous rocks in ^axonyy in the ioxm. 

 cf a white friable lode powdery iubPaiice, and teems to ori- 

 ginate from crylUiiizcd fcienitc, and will not concjete with- 

 out being wetted : feels dry and meagre, hardly fmks in 

 water, ib not gritty between the teeth ; when heated beloA^ 

 rednel's, it becomes of a dazzling v/hiie : ha^ no lullre or 

 traniparsney. 



^renaniym, C.onfirting of white difttn£l fubdiaphanous granulations. 

 Calx aldballrina. i^yjl. nat^ xii. 3. /. 208. n. 7. 

 Found in Thur^ngiay and originates from Alabailcr which ha3 



crumbled to powder : it refembles the laft, except that iti. 



particles are larger, refembling hriail grains of fand, and are 



very gritty i>ciwecn the teeth. 



J!uh-S' Coinpad, dry and meagre, a little fliinlng, breaking into 

 iTi*m. itideterminatc fragments, of a common form, receiv- 



inLf a pal i 111. 

 Gypfum partie. impalp. Syfl, nat. xii 3. p. 45. ». 3. 

 Gvpfum part, minim. Wall. fy(K i. /. 154. ». i. 

 Alabaltriini. Vogel mineral. 119. 

 Com pi! (ft Gvpfum. Kirivan miner. \. p. 121. 

 Alabafter ^chmeijftr mineral. 1. ^.240. 

 Compact Gypfum. Iham/on chem. 3. p, 615. 



2. Stalactites gvpf.-iJS. Syji, not, y^x, '^. p, 184. ». 5. 



Found in Dcrhyjbirey Per/ia, and various parts of RvJJiey Spain, 

 Tii/cany, Sicf/yy and other places, in ilratified mountains: 

 colour various, fometirnes fpotted, interfcded with veins, and 

 fiepicted with various colours : does not efFervefce with acids, 

 when pure, is fofter than marble, and docs not take a good 

 polifli : texture ihivery and glittering: fpecific gravity from 

 1,^72. to 2,288. contains carbonate of lime 32. fulphuric 

 fkQi^ 30. water 38. 



