I have examined ſome ſpecimens from Saxony which ſometimes contain no ſilver. May we not therefore ſuppoſe that the ſilver is native and not mineralized?

§ 168.

ARGENTUM (ſilver), mineralized by ſulphur, arſenic, iron and cobalt.

The ſilver is ſometimes more than ⁵⁰⁄₁₀₀.

§ 169.

ARGENTUM (ſilver), mineralized by ſulphur, arſenic, copper and iron. White ore.

Cronstedt Min. § 171. Minera argenti alba.

The proportion of ſilver varies much, ſometimes it is ¹⁰⁄₁₀₀ or more.

§ 170.

ARGENTUM (ſilver), mineralized by ſulphur, arſenic, copper, iron, and antimony. Grey ore.