NEW YORK STATE MUSEUM 



Calcite from Rondout, showing crystal of the fourth type (pris- 

 matic habit). Forms: a (1120), e (0112), A (15.4.19.3), n 

 (3. 16. 19.2). 



Calcite from Rondout, showing crystal of the fifth type. Forms : 

 e (0112), rj (0441), A (15. 4. 19.3). 



Calcite from Rondout showing crystal of the sixth type. Forms: 

 e (0112), I (0445), T (0.12.12.1), the latter form is new to the 

 species. 



Calcite from Rondout, showing variation of the sixth type. 



The presence of vicinal planes in the zone of the negative 



rhombohedrons produce highly curved faces. 



Calcite from Rondout, showing crystal of the seventh type. 



Forms: r (1011), e (0112), v (6175), D (8. 1.9. 10) (?). 



Calcite from Rondout, showing crystal of the eighth type. 



Forms: e (0112), X (3142), Y (5382), 6 (10.3. 13.2). 



