antimony - Sciencemadness.org
antimony - Sciencemadness.org
antimony - Sciencemadness.org
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36 THE METALLURGY OF ANTIMONY.<br />
Arequipite.<br />
Composition.—Silico-antimonate of lead.<br />
Properties.—Compact, wax-like. Fracture conchoidal. H. = nearly<br />
6. Colour honey yellow. Fuses with difficulty before blowpipe on<br />
charcoal, resulting in antimonial vapours and buttons of lead.<br />
Occurrence.—In quartzose gangue with argentiferous lead carbonate<br />
and chrysocolla at the Victoria mine, Tibaya, Peru.<br />
Arsenstibnite.<br />
It is an arsenical hydrate of <strong>antimony</strong>.<br />
Atopite.<br />
Composition.—Perhaps a calcium pyro-antimonate, Ca2Sb207 or<br />
2CaO.Sb2O6. Iron, manganese, and the alkali metals are also<br />
present.<br />
Properties.—Isometric; in octahedrons. Under reducing flame<br />
on charcoal, sublimes in part and leaves a dark infusible slag.<br />
Occurrence.—At L&ngban, in Wermland, Sweden.<br />
Barcenite.<br />
Composition*—Santos gave the following analysis:—<br />
Antimony 50 "11 per cent.<br />
Sulphur 2-82<br />
Mercury 2075<br />
Calcium 3*88<br />
Oxygen 17*61<br />
Water 473<br />
Hence it is an antimonate of mercury.<br />
Properties,—Massive; structure finely granular. Brittle. H. = 5*5.<br />
G. = 5*343. Lustre dull. Colour dark gray. Streak ash-gray with<br />
slight greenish tint.<br />
OccurreTice.—Huitzuco, state of Guerrero, Mexico.<br />
Berthierite.<br />
Composition.—Probably FeSb2S4 or FeS.Sb2S8.<br />
Properties.—In elongated prisms; also fibrous, massive and granular.<br />
H. = 2-3. G. =4-4'3. Lustre metallic. Colour dark steel-gray<br />
Before blowpipe on charcoal gives off sulphurous and antimonial<br />
fumes, leaving behind a black magnetic slag.
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