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NATURAL HISTORY OF ARSENIC.

Class I. ...BRITTLE AND ACIDIFIABLE METALS.

AMSEN1C,

PART XXXIV.

SECT. I.

NATURAL HISTORY OF ARSENIC.

ZA.RSENIC is scattered in great abundance over the mineralkingdom. It is found in black heavy masses ot little brilliancy,called native arsenic, (testaceous arsenic.) It is found in differ-ent parts of Germany. Mineralized by sulphur, it forms sulphu-rized arsenic, or orpiment. This mineral is met with in Italy,about Mount Vesuvius. There are two varieties of this orewhich differ from each other in colour, occasioned by the dif-ferent proportions of its component parts. The one is calledyellow sulphurized arsenic , or orpiment ; the other, red sulphu-rized arsenic, or realgar, (ruly arsenicj ; both are met with inHungary and different parts of Germany. The colour of thefirst ore is a lemon yellow, inclining sometimes to a green; the