
THE ARSENIC GROUP. 99 
Color and streak tin-white, but usually dark grayish from 
tarnish. Brittle. H.=3°5. G.=5°65-5:°95. 
B.B. volatilizes very readily before fusing, with the odor 
of garlic; also burns with a pale bluish flame when heated 
just below redness. : 
Obs. Occurs with silver and lead ores. It is found in 
considerable quantities at the silver mines of Freiberg and 
Schneeberg; also in’ Bohemia, the Hartz, at Kapnik in 
Upper Hungary, in Siberia in large masses, and elsewhere. 
In the United States it has been observed at Haverhill 
and Jackson, N. H., and at Greenwood, Me. 
spiment —Yellow Arsenic Sulphide. 
Trimetric. Cleavage highly perfect in one direction. In 
- foliated masses, and sometimes in prismatic crystals. Color 
and streak fine yellow. Lustre brilliant pearly, or metallic 
pearly, on the face of cleavage. Subtransparent to translu- 
eemn seciile, Hl 1°5>-2. “G. =3°4—3"5. 
Composition. As,S,=Sulphur 39:0, arsenic 61:0. Wholly 
evaporates before the blowpipe with an alliaceous odor, and 
on charcoal burns with a blue flame. 
From Hungary, Koordistan in Turkey in Asia, China, and 
South America. Occurs at Edenville, N. Y., as a yellow 
powder, resulting from the decompositon of arsenical iron. 
Realgar is another arsenic sulphide. It has a fine clear red color, 
aurora red to orange, and occurs transparent or translucent ; H.= 
15-2 ; G.=3'35-3°65 ; Composition, AsS=Sulphur 29°9, arsenic 70:1. 
Like the preceding before the blowpipe. From Hungary, Bohemia, 
Saxony, the Hartz, Switzerland, and Koordistan in Asiatic Turkey. 
It has been observed in the lavas of Vesuvius. 4 
Realgar is one of the ingredients of white Indian fire, often used as a 
signal light. Orpiment is a coloring ingredient in the pigment called 
king’s yellow, in which it is mixed with arsenious acid. 
Arsenolite.—White Arsenic. 
Isometric. In minute capillary crystals, and botryoidal 
or stalactitic. Color white. Soluble; taste astringent, 
EeenishacH: =e GrS3"t: 
Composition. As, O,== Arsenic 75°8, oxygen 24:2=100. 
This is the same compound with the common arsenic of 
the shops. It is found but sparingly native, accompanying 
ores of silver, lead, and arsenic in the Hartz, Bohemia, and 
elsewhere. It is a well-known poison. 
