MICROSCOPIC IDENTIFICATION OF INORGANIC SALTS. 



11 



Table 2. — Uniaxial Positive Substances — Continued. 



Substance. 



BeO 



K3Na(Cr04) 

 AgBrOs.... 



Hg2Cl2 



(PbCl)2C03. 

 Agl 



CdS 



SiC 



HgS 



System! 



Hex 



Trig 



Ditetrag 

 Pitetrag 

 Tetrag. . 

 Hex . . . : 



Hex 



Ditrig. . . 



Trig 



ud 



1. 7190 

 1. 7278 

 1.8466 

 1. 9733 

 2. 1140 

 2.230 

 2. 5.52 



(red).. 

 2.688 

 (green). 

 2. 78 

 2. 8540 

 (red). 



eo 



1. 7330 

 1.7.361 

 1. 9200 

 2. 6559 

 2. 1400 



2.8320 

 3. 2010 



(red). 



.014 



.0083 



.0734 



. 68265 



.026 



Weak 



Weak. 



.045 

 .347 



Table ^.— Uniaxial Negative Substances. 



Substance. 



System. 



Na-SiFrO Hex... 



CuSiFs.6HjO {< I Trig... 



CaCI . .6S5O i Trig. . 



LiKSO. Hex... 



BeSO<.4HvO : Tetras 



Pb4(PbCl)(AsO03 Hex... 



4NarS04.Na;C03 ' Hex... 



Sr(OH)2.8H20 i Tetrag. 



KHrP04 j Tetrag. 



NiSOi.eHjOe 



Tetrag 



Modification. 



Trig 



Tetrag 



Tetrag 



Trig 



Trig 



Tetrag 



Trig 



Tetrag 



K"3Cu(CN)4 



(NH4)HoP04 



ZnSe04.6HoO 



SrSn06.4H56 



SrCli.eHsOrf 



NiSeO^.BH.O 



CaS;O6.4H20 



KHtAsO< 



(NH4)H2AsOj I Tetrag 



NaNOs Ditrig... 



(NH4)4Fe(CN)e.2NH4C1.3HoO Trig 



KfCuClj.2H. O e Ditetrag 



Ca(0H)2 i Hex 



CaCOi I Trig 



4(NH4)fS203.AgBr.NH4Br | Tetra 



CaMg(CO,)" 



AlClSO.!.6Cu(OH)2.3H20/ 



Rliomb. . 

 Ditrig. . . . 



MgCOs i Trig 



LiNOs g j Trig 



NaioCu2Ag4(S203)8-6NH3A 1 Tetrag. . . 



(NH4)rCuCl4.2H20 1 Ditetrag. 



BaAg.Cs.i(NCS)7 Ditetrag. 



CssTl-CU I Hex 



KzPtI t(N02)2.2H20 i Ditetrag. 



BaCutCs-,(NCS)7 i Ditetrag. 



Ag?HP04 ! Tng 



ZnCO, j Trig 



MnCOs ' Trig 



SrCu.Cs3(NCS)7 Ditetrag. 



FeC03 1 Trig 



CaW04 1 Tetrag... 



EjH0TeI.O10.2H2O i Trig.. . . 



PbW04 1 Tetrag. 



PbMo04 i Tetrag. 



MnTiOs/ '< Rhomb. 



Trig 



AgaSbSs 

 AgsAsSs*. 



Tng. 



1.300 



1.298 



1.4092 



1.4080 



1.417 



1-393 



1.4715 



1.4721 



1.4720 



1.4.395 



1.474 



1.465 



(red) 



(red) 



1.4807 



1.4614 



1.4991 



1.4758 



1.5095 



1.4684 



1.5109 



1.4873 



Mean n 

 1.5246 1 

 1..5291 ! 

 1.5298 ' 

 1..5364 ' 

 1.5.393 I 

 1.5496 '. 

 1.5674 

 1.5766 

 1.5S74 j 

 1.6198 ' 

 1.6.J65 i 

 1.644 1 

 1.65837 

 1 .6769 I 

 i.6S174 

 1.694 

 (green) 

 1.717 

 1.73.3 



1.744 

 1.7761 



1.784 



1.7909 



1.8013 



l.S0.i6 



1.818 



1.82 



1.8535 



1.873 



1.9.345 



(red) 

 2.1 21 

 2.2685 

 2.^02 



(red) 

 2.481 

 3.084 



(Li.) 

 3.08/7 



1.5215 

 1.4792 

 1.5039 

 1.52.52 

 1.4866 

 1.5125 



"'i".5i79" 

 1..5217 

 1.3361 

 1.5922 

 1.6148 

 1.446 

 1.4864 

 1.6294 

 ] .50256 

 1.641 



(green) 

 1.515 

 1.435 

 1.7 

 (approx.) 

 1.724 

 1.6788 

 1.774 

 1.6527 

 1.6882 

 1.7983 

 1.6177 

 1.5973 

 1.6982 

 1.633 

 1.9185 



(red) 

 2.0.00 

 2.182 

 2.304 



(red) 

 2.21 

 2.881 



(Li.) 

 2.7924 



a Indices determined by Due de Chaulnes metliod. 



6 Color deep blue. 



c Co.or emerald green 



d Bolland gives 1.50, 1.52, 1.545 for n. 



c Greenish blue. Pleocluoism: Grass green, sky blue. 



/ Pleochroism weak: Green, blue-green. 



g Personal communication, Dr. E. T. Wherry. 



ft Color deep blue. Pleochroism: Pale sapphire blue, deep cobalt blue. 



i Color reddish yeUow. Pleochroism: || Ciiief axis greenish yellow, j_ orange. 



;■ Color deep blood led. No distinct pleochroism. 



k Pleochroism: Blood red, eochiueal red. 



0.004 

 .0012 

 .024 

 ^ .0006 

 .0325 

 .009 



.0193 

 .0233 

 .Otll 

 .02.36 



Very weak: 

 .0454 

 .0252 

 .0044 

 .0!98 

 .0268 



!6495' 



.0549 



.2513 



.0276 



.0217 



.198 



.17197 



.0i75 



.17918 



.053 



.202 

 .300 



.020 

 .0973 

 .010 



.1382 



.1131 



.0053 



.2003 



.2227 



.1553 



.240 



.0160 



.1121 

 .0865 

 .098 



.271 

 .203 



