37 
mineralogy, 
SEC T. XXXVII. 
5. Calcareous Earth united with the Calx df 
Lead, ^erra calcarea^ cerujfa nativa intim^ 
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, Friahilis. 
a. White, from Krifterfberget at Nya Kop* 
parberget in Weftmanland. 
.SECT. XXXVIIL 
S. Indurated. 
I. Scaly. 
a. Yellowifli, from Krifterfberget f / 
SECT. XXXIX. 
Ohferoations on the Calcareous Earth in general. 
The calcareous earth is diftributed over the 
whole world in proportion to the great ufe made 
of it, though it fometimes is abforbed and con- 
cealed in heterogeneous fubftances. If it could 
be proved, that Nature, to perform its works, 
does not require more than thofe two adive 
d Both tliefe 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 (Sed:. xxxiii.). Thus may thefe be dillinguiihed 
from other lead-ochres and fpar-llke lead ores, which are 
much richer in lead, and never effervefce with acids. Thefe 
laft mentioned alfo feem to be produced by nature, nearly as 
the fpar-like lead ores, and as the forn Batumi are formed in 
calcining a regale of lead, 
D 3 ■ agents, 
