SOME CALCITE CRYSTALS WITH NEW FORMS 9 



For the new form I { 3.10.13.3 | only two faces arc present both 

 of which gave poor reflections, one much more so than the other. 

 The one giving a poor but distinct signal, gave: 



0=12° 54' (calc. = 12° 44') 

 io=75 36 (calc. = 75 31) 



The limits of repeated measurements of these two faces gave: 



The form was seen to lie in the zone rm and measurement of 

 the angle (1011) : (13.10.3.3) gave 50° 35' (calc. 50° 16'). The form, 

 considered as well established is shown in fig. 5. 



Fig. 5 



Crystal no. 2 is incomplete, and as now formed, nearly equidi- 

 mensional, measuring a centimeter in diameter. It is colorless and 

 while transparent in part, is cloudy and translucent in other places. 

 The forms present on this crystal are: m\ 1010 \, r\ 1011 1,^1 0jl2 | , 

 /j 0221 1, and the three new forms o { 0.14.14.17 | , O | 8.2.10.3 } , 



