MICROCHEMICAL REACTIONS OF ANTIMONY 399 
Tetragonal. — Barium-antimonyl tartrate (T or 0 ). 
Orthorhombic. — Yellow tri-iodide (OorM); ba¬ 
rium-antimonyl tartrate; potassium-anti- 
monyl tartrate; sodium-antimonyl tartrate. 
Monoclinic .—Antimonyl chloride. 
Triclinic. 
DETECTION. 
A. By Means of Cesium Chloride. 
Apply reagent by Method III, page 300, to the drop 
strongly acidified with hydrochloric acid. 
A double chloride of cesium and antimony of the formula 
2 CsCl-SbCls • 2| H2O separates in hexagons and elongated six- 
sided plates. Many of the hexagons show a system of straight 
or curving ribs extending from the center to the angles of the 
hexagons. 
Bismuth yields rhombs, prisms or long plates showing an 
hexagonal outline, and having a lower solubility than the anti¬ 
mony salt. 
Copper yields a series of double chlorides varying in color from 
bright yellow to deep red depending upon the amount of copper 
present. These salts usually separate in yellow rectangular 
prisms or red acicular crystals, but the red compound sometimes 
assumes forms closely resembling the iodo-compounds referred 
to below. 
Tin causes the immediate precipitation of tiny regular octa- 
hedra of the formula Cs2SnCl6, a salt of chlorostannic acid. 
Cesium chloride has remarkable powers of forming more or 
less difficultly soluble double chlorides with a large number of 
elements and we may thus expect to often find in preparations 
to which cesium chloride has been added an abundant crop of 
well-formed crystals, whose origin is puzzling unless we know 
what elements are present. 
Given the proper concentrations we may expect cesium chloride 
to form double chlorides with the chlorides of Cu, Mg, Zn, Cd, 
Hg, Sn, Pb, Sb, Bi, Mn, Ni, Co, Fe. But no double cesium 
