A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...

40 THE METALLURGY OF ANTIMONY.
Jamesonite.
Composition.—Pb2Sb2S5 or 2PbS.Sb2S3.
Properties.—Orthorhombic. Usually in acicular crystals; but
common in capillary, cobweb-like forms. Brittle. H. = 2-3. G. =
5-5-6-0. Lustre metallic. Colour steel-gray to dark lead-gray.
Opaque.
Occurrence.—Principally in Cornwall, associated with quartz and
crystals of bournonite; also in Siberia; in- Hungary; at Valencia
d } Alcantara in Spain; Sevier Co., Arkansas; at the Montezurna
mine, Nevada.
Kermesite.
Composition.—Antimony oxysulphide, Sb2S2O or 2Sb2S;rSb208.
Properties.—Usually in tufts of capillary crystals; prismatic;
orthodiagonal. H.= 1-1*5. G. =4*5-4*6. Lustre adamantine.
Colour cherry-red. Streak brownish red. Feebly translucent.
Occurrence.—Results from the alteration of stibnite. At Malaczka,
near Posing, in Hungary; at Braunsdorf, near Freiberg.
Kobellite.
Composition.—Pb2(Bi.Sb)S5 or 2PbS.(Bi.Sb)2S3 (if Bi: Sb = 2 :1).
Properties.—Massive, sometimes fibrous and radiated like stibnite ;
also finely granular. Before the blowpipe, on charcoal, a yellow
coating of Bi2O3 near the assay, and, beyond, white Sb2O8.
Occurrence.—In the cobalt mine of Hvena in Sweden.
Livingstonite.
Composition. —HgSb4Sr or HgS.2Sb2S8.
Properties.—In groups of slender prismatic crystals; also columnar,
massive, resembling stibnite. H. = 2*0. G. = 4*81. Lustre metallic.
Colour bright lead-gray. Streak red.
Occurrence.—Huitzuco, Mexico.
Meneghinite.
Composition.—Pb4Sb2S7 or 4PbS.Sb2S8.
Properties.—Orthorhombic; crystals slender prismatic, vertically
striated. Also massive. H. = 2*5. G. = 6-34-6*43. Lustre metallic,
bright. Colour blackish lead-gray. Streak black and shining.
Occurrence.—At Bottino in Tuscany; Ochsenkoff, Saxony ; and at'
Goldkronachf