382 



MINERALOGY 



New Jersey. Some very large rhombohedrons twinned after this 

 law were taken from a cave in the Joplin district of Missouri. 



FIG. 440. Calcite with a Scalenohedral Habit. Cumberland, England. 



FIG. 441. Calcite twinned on the Rhombohedral Face e (0112). Joplin, Missouri. 



