Part 26

ARSENICUM nativum (arſenic), native, united to iron. Native.

CRONSTEDT Min. § 239.

I have never found it free from martial impregnation.

§ 221.

ARSENICUM nativum (arſenic), native, united to ſilver.

§ 222.

ARSENICUM calciforme (arſenic), deprived of phlogiſton. Calciform.

CRONSTEDT Min. § 240.

§ 223.

ARSENICUM (arſenic), mineralized by ſulphur. Yellow.

CRONSTEDT Min. § 241. Auripigmentum. Riſigallum.

§ 224.

ARSENICUM (arſenic), mineralized by ſulphur and iron. Pyritical.

CRONSTEDT Min. § 243. A. Pyrites arſenicalis.

COBALTUM, OR COBALT.

§ 225.

Its ſpecific gravity is 7,700. Nitrous acid and aqua regia readily diſſolve it. The vitriolic acid requires to be boiled nearly to dryneſs. The muriatic and acetous acids do not act upon it unleſs previouſly calcined. 270 expreſſes the quantity of ſaturating phlogiſton, which it retains with the ſame force that iron does. Common regulus melts in the ſame heat that copper does, but when well purified it is hardly eaſier to melt than iron.

§ 226.

COBALTUM nativum (cobalt), native and united to arſenic. Native.

CRONSTEDT Min. § 249.

§ 227.

COBALTUM calciforme (cobalt). Calciform.

CRONSTEDT Min. § 247.

It is found variouſly mixed, principally with arſenic, iron and copper, but whether mechanically or by a more intimate union I know not.

§ 228.

COBALTUM (cobalt), mineralized by acid of arſenic. Red.

CRONSTEDT Min. § 248.

The ſmall ſpecimens that I have been able to examine point out ſuch a compoſition.