Kraus — Occurrence of Celestite near Syracuse, N. T. 31 



the fresh mineral can be seen to the left. 3. The mineral 

 may also occur disseminated not in the form of well-defined 

 crystals but rather in small circular spots, which in some 

 cases are about uniform in size, while in other instances 



they may vary from three-sixteenths of an inch down to a 

 needle-point. Figure 5 illustrates this occurrence of the 

 mineral. JNo doubt the crystallization was so rapid that it 

 was impossible for the mineral to assume well-defined forms. 



In the first two types of dissemination the orthorhombic char- 

 acter of the crystals is very easily recognized. The mineral is 

 also characterized by a slight blue tint. 



Numerous attempts w T ere made to isolate crystals so as to 

 make goniometric measurements. In every case, however, the 

 crystal faces were dull and gave no reflections whatever. The 



