468 



MEASUREMENTS 01 CRYSTALS, 



CALCAREOUS SPAR. (Contmucd.) 



c on^ 1]6°33'55" 



c on 90 



h onh' 92 12 



m onm' 114 19 



Fig. 76 is a twin crystal from Martins- 

 burgh, Lewis county, and Haver- 

 straw, Rockland. 



CALCAREOUS SPAR. 



Fig. 79 is a twin from Patterson, Putnam 

 county. Face of composition per- 

 pendicular to the axis of the aggre- 

 gated crystals : angle of revolution 

 60°. 



