NEW FOHMS. 



51 



tion of the crystal, which shows two faces of the form. The second 

 side of the crystal is, however, not present, as a cleavage face of (OlO) 

 terminates that sido of the crystal. On crystal 19 the form J9{123} 

 is represented by a line face lying between #{5.9.14} and /{Oil}, 

 both of which are larger than B. This occurrence is represented in 

 figure 29 (p. 67). The form is probably also present on crystal 20, 

 where a nonmeasurable line face was observed between J{112} and 

 /{Oil}, though it could not be determined whether the form was 



{123} or {5.9.14}. 



Measurements of *E{5.9.14}. 



The first two occurrences of "{5.9.14} are small faces, much wider 

 than the usual line faces and, as shown in figure 29 (p. 67), the face 

 on crystal 19 reaches a fair size, whereas the corresponding simpler 

 form #{123} is present as a line face. On crystal 20 (fig. 30, p. 68) 

 the small face of #{5.9.14} lies between J{112} and /{Oil} and also 

 attains an appreciable size. On crystal 27, however, it is present as 

 a mere line face. 



The symbols for the form E are rather complex and unusual, but 

 the identification of the form on three crystals, the small distinct 

 faces, and the close agreement between measured and calculated 

 angles show that the form is well established. 



Measurements of *A { 337 } . 



The form A is characteristically a line face between c{001} and 

 J{112}. The only forms in this zone observed on these crystals are 

 m{110}, ^{111}, J{112}, ^{337}, c{001}, {Tl2}, and o{Ill}. The 

 form is shown in figures 25 and 30 (pp. 66, 68). 



*Z>{313}. Only one face of this new form was observed, this 

 being on crystal 19, where a small face yielded a fair reflection 

 whose measurement gave <j>, 74 21' (calculated 74 44'); f>, 47 21' 

 (calculated 47 38'). The form is shown in figure 29 (p. 67). 



