a 8 Elements of Mineralogy, 



Limejlones, Albarefe of the Italians. 



All ftones which are ufually burned to 

 lime, are comprehended under this name ; 

 fome are of a lamellar and fome of a gra- 

 nular texture ; their colours are various, the 

 pureft are white, grey, or bluifh grey, their 

 proportion of aerial acid is fomething greater 

 than that in fpars, and all contain fome fmall 

 proportion of argill, quartz and iron. 18 

 Roz. 345, Mr. Meyer afferts, that in the 

 pureft limeftones he has examined, thefe 

 foreign ingredients amounted to about four 

 per cent, he alfo fays that he has found 

 marine Epfom and fea fait in fome fmall 

 proportion in all of them, i Meyer^ 5,20, 

 and 21. Some limeftones found in Scania, 

 contain orpiment according to Scheffer* 

 account. Among limeftones we may reckon, 

 that called St. Stephen's ftone by Cartheufer 

 and Vogel^ becaufe it has fome red fpots on 

 its furface refembling blood ; the lamellar 

 limeftones ufually contain petrifactions, chiefly 

 of marine animals and alfo {hells ; the fpe- 

 cific gravity of limeftones is from 2,65, to 

 2,70, generally. 



Ketton Stone is a remarkable fpecies of 

 limeftone, confifting of very fmall globules 

 like the roe of fifti, concreted together, 



Jlence 



