65 



following localities. At No. 3 it occurs in association with 

 calapleiite, eiididymite, aegirine, etc. ; at No. 4 it is found together 

 with neptunite of type I, elpidite, quartz , etc. ; at No. 9 it is 

 associated with elpidite etc., at No. 13 with lorenzenite needles, 

 and at No. 15 with rhodochrosite and elpidite. 



Type II (Broad plates). 



The epididyniite crystals belonging to this type are charac- 

 terized by being broadly tabular parallel to the base (Fig. 7, 

 Plate III). They attain considerably larger dimensions than the 

 crystals of the foregoing type. The largest individuals that have 

 been met with are 3*^"" in width and l""" in thickness; yet they 

 are only fragments and must, therefore, have been still larger. 

 The dominating forms are the third and the second pinacoid. 

 The former (the base) is always strongly striated parallel to the 

 a-axis. Deeper depressions often run in the same direction, 

 indicating that the crystal plates are formed by a number of 

 needles that have grown together, showing a transition from 

 type I to type 11. The second pinacoid is also in general 

 striated longitudinally. 



The combination-edges between the two dominating pina- 

 coids are truncated by a number of planes. On the goniometer 

 one obtains for them a large number of more or less distinct 

 reflections. Several of them are here neglected, as not leading 

 to simple symbols. The forms given below as quite certain 

 have comparatively simple symbols ; all of them have been 

 observed more than once. They are: 



^ = {0. 1. 12}, r = {0.1.10}, s = {015}, ^ = {025}, w = {035}, 

 г; = {032), ж = {071}, г/ = {091}. 



Besides these, all the forms of this series stated as belong- 

 ing to the foregoing type have also been observed on type II. 

 The new forms are determined from the following measurements. 

 XXIV. 5 



