129 



TABLE 124.— REVERSIBLE TRANSITIONS IN CRYSTALS (concluded) 



Substance Phases 



NaF.Na.SO4 



Na 2 C0 3 



NaN0 3 



Na 3 AlF, 



Na.MoO* 



Na.WO* I-L 



II-I 

 III-II 



NaAlSiO« neph.— earn. 



carnegieite 



NaGH 3 0, e .... 



Ni Curie point 



Ni 3 S 3 



NisAsj 



Oxygen I-II 



II-III 



Phosphorus L-I 



I-II 



PbO red-yellow 



PbSO* 



PbCrO* 



PbWO< 



RbOH 



RbC104 



Rb 2 S04 



Rb J Ca 2 (S04) 3 



RbLiSO« 



RbN0 3 I-II 



II-III 



RbCl '.'.'.'. 



RbBr 



Rbl 



Sulphur I-II 



L-I-II 



SbjOa rhomb.-reg. 



SbCl 3 I-II-III 



SiO,' I-II 



Si0 2 ' I-II 



SiO a * I-II 



II-III 

 Si0 2 



«, f 



K t 



Sn 



Sn0 2 '.'.'.'. 



SrS0 4 



SrC0 3 



TICIO, 



Til 



TINO3 I-II 



II-III 



Tl picrate 



Tl 



TiBr, 



W,C 



ZnS* 



ZrO, 



t Third modification at room temperature. t Acetone. § Five other modifications; not accurately 



located. 11 Very beautiful for demonstration purposes. a Leucite. b Probably pentamorphic, inv. 



at 1150° and 1300°C. c Acetate. d Sluggish. e Quartz. / Cristobalite. g Zincblende and 



wurtzite. h Tridvmite. 



SMITHSONIAN PHYSICAL TABLES 



