mineralogy; 37 



sect. xxxvii. 



3. Calcareous Earth united with the Calx of 

 Lead, "terra calcarea ceruffa nati-va intlim 



mixta. 



This is a lead ochre, or a fpar-like lead 

 ore, which, in its formation, has been mixed 

 with a calcareous earth, and for that reafon 

 effervefces with acids. 



A. Loofe and friable, Friabilis. 



a. White, from Krifterfberget at Nya Kop- 

 parberget in Weftmanland. 



SECT. XXXVIII. 



B. Indurated. 

 1. Scaly. 



a, Yellowifh, from Krifterfberget -Jy 



SECT. XXXIX. 



Ob fey -cations on the Calcareous Earth in general. 



The calcareous earth is diflributed over the 

 whole world in proportion to the great ufe made 

 of it, though it fometimes is abforbed and con- 

 cealed in heterogeneous fubitances. If it could 

 be proved, that Nature, to perform its works, 

 does not require more than thofe two active 



\ Both thefe varieties contain a confiderable quantity of 

 lead, viz. forty per cent, more or lefs, and the calcareous 

 earth is as equally and intimately mixed with it, as in the 

 white iron ore (Seel, xxxiii.). Thus may thefe be diftinguifhed 

 from other lead-ochres and fpar-like lead ores, which are 

 much richer in lead, and never efftrvefce with acids. Thefe 

 lafl: mentioned alfo feem to be produced by nature, nearly as 

 the fpar like lead ores, and as thejf;r« Batumi are formed in 

 calcining a rcgule of lead. 



D 3 / agents, 



