186 



JFbrd, Ward and Pogue — Mineral Notes. 



e (Oil), a (031), #(121). The crystals were all attached and no 

 faces terminating the antilogous poles were observed. They 

 were usually developed as shown in figure 1, while the pyramid 

 Vi the brachydome i and the new macrodome j, were only 

 observed on a few crystals, and then but as small truncations, 

 as is shown in figure 2. The hew f ormj (407) occurred as very 

 small but definite-shaped faces, which did not yield very sharp 

 reflections. No other simple indices would satisfy the angle 

 measured, and it is thought, therefore, that the identity of 



Fig. 3. 



Fig. 4. 







~w % \ 





/ 



/ A \\ 





f- A ---, 



/ \ A 1 ~~ \ 



\V 



^r=^__^ 



— \ L 





m 



.a 



/ 772 



A 





,<.„_ /> 



the form is reasonably well established. The measured angle 



being 



of o (001) a^' (407) 

 19° 12' 45". 



was 19° + , the calculated 



angle 



2. Calcite Crystals from Kelly's Island, Lake Erie y* by W. E. 

 Ford and J. L. Pogue. 



Recently, through Mr. Lazard Cahn, the Brush Collection 

 received some calcite crystals from Kelly's Island, Lake Erie, 

 which were remarkable in tliat the prominent form upon them 

 was the rare pyramid, 7(8*8*16*3). The pyramid exists on the 

 crystals alone with the exception of a rounded rhombohedral 

 termination which was assumed to be 6(0112). Thejneasured 

 angles which identified the pyramid form were, (8-8*16"3) A(8'8* 



* The form /(SWIG'S) has been noted as a prominent form on crystals 

 from Bellevue, Ohio. Farrington and Tillotson, Field Columbian Museum, 

 Geol. Series, iii, No. 7, 144, 1908. 



