i2o EARTHS. ARGILLACEOUS. 32. Puteolana. 



Found near Criefdorf in Bwvaria^ and near Schemniz in Iluft' 

 • garyy cinereous, ytllowifh, or yellow-red; contains g^ of 

 lilver. 



aurlfera^ Soft, plafiic, blueifh, exhibiting gold when fufed with 

 lead. 

 Born. inci> fofs. I. />. 67. 



Found in the mines of Tran/ylvania, near Hercx.igan and 

 FaCebai. 



32. PUTEOI^ANA. Confifting of alumina, filica, 

 and iron, with generally fome carbonate of lime: 

 friable : mixed up with water and quicklime be- 

 ccning fo hard as not to be penetrated by wateo 

 eafily melting in the fire into a black fcoria. 



genuina. Of a dull colour, tinged, readily obeying the magnet. 



Terra pouzzotana. Cron/L min fed. 207. «. 8, I. 



Cacmentum pulverulentum Wall.jyji, i, /-9c. n. 7. 



Pouzzolana. Kirnx)an mi>eral. 1./. 411. 



Pouzzolano, Thomjon chem. 4. p. 149, 



Found in the vo'canic mountains o^ Italy , even in thofe that are 

 extinrt, chiefly about Naples and RomCi where it is colie<fled 

 into tumular mafles : colour dull red, brown or black : fur- 

 face rough, uneven, and of a baked appearance : fra^bure un- 

 even or earthy and porous: it is not difFulible in cold water» 

 but in boiling water it gradually depofits a fine earth: with a 

 fmall portion of lime it makes an excellent mortar, which har- 

 dens even under water. 



^ssimilis^ Of a dull colour, tinged, hardly obeying the rnagnet. 

 De S. Fond fur lei diff efpec. de Pouz, 1780. 8. 

 Found near Chernavari in France^ in Germany, and Fra^conia^ 

 and probably originates from decayed argillaceous ftones. 



f2i;:eres. Cinereous, in the form of afhes. 



Cineres Vulcanorum. Cronst. miner, 297, 

 > Volcanic afhes. K>r-iv an mineral i /'.410. 

 Vclcmic afhes. H homlon chem, 4. p, 150. 

 Found in the neighbourhood of moil volcanic mountains, from 

 which they arc ejected with vaft force, atid often to a great 

 height and diftance, frequently covering vaft furfjccs, and 

 fjmetimes burying whole cities: they are fometimes fo fubtile 

 as to fin up the riiinutell crevices: colour brownifh or red- 

 difli-grey : they effervefce flightly with acids, have frequently 

 a magnetic power, and ufualiy contain about half their weight 

 y -ofargill, a fmall proportion of calx, magncfia and iron, the 



rcmamder is filica. 



