486 University Geological Survey of Kansas. 
of the vertical zone merging gradually into each other. Only 
a few crystals of this type were found. Figure 57 illustrates 
crystals of the type. Measurements are as follows: 
No. of 
Angle. measure- Average. Calculated. 
ments 
Sb AAs | OLIAAOTTe 8 ae AT? 40! 
S-a% | 0112,0-14.14.1 6 59 48 59 364 
A. 2. | O1F2 014-141 4 11 30 1D eh 
p, +R; K:;:, R*. 
Small, clear, colorless crystals from the Gracie Clark mines, 
illustrated in figure 58. This is the only type of crystals on 
which mis the dominant form. The faces are bright and 
highly polished, with the exception of 7 which is dull, on 
account of minute etch-points. The appearance of this form 
is different from the usual one with its rib-like striations. 
Measurements were made as follows: 
No. of 
Angle. measure- Average. Calculated. 
ments. 
m- Ab 40411010 4. 14° 54 14° 13’ 
‘yap Bills tse, 48s. 
Small, colorless crystals from the Portland mine, Leadville 
hollow, Joplin. This type, of which only a few crystals 
were found, consists of the single form S- as illustrated in 
figure 69. The form is identified by the fact that it trun- 
cates the cleavage rhombohedron. 
Dyer 22. KK a Res, ave 5) Dey tp Es Mee EA Ee Seniors les 
ye, —¢R n-. +5R; g-, —2R; db, oh. 
Medium-sized, amber-colored crystals from the Gracie Clark 
mines. This most nearly resembles type 2, but as some of 
the forms are different and the localities widely separated 
they are designated as a separate type. The surface of K: 
is marked with growth figures of the kind so commonly ob- 
