SOME CALCITE CRYSTALS WITH NEW FORMS II 



Four faces of the form j 2.16.18.1 | are present, the remainder 

 of the crystal having cleaved off. While all the faces are bright, they 

 are very rounded and in some cases form with in \ 1010] a rounded 

 surface. They gave, however, a bright signal in the midst of the mass 

 of signals caused by the rounded surfaces and it is these single bright 

 signals that were measured. 



calc. = 5° 49' p = 86° 36' 



meas. 5 48 86 39 



5 31 86 27 



5 54 86 33 



5 37 86 33 



Av. - 6 43 86 33 



Fig. G 



Measurements of the prism face (in zone cem) gave p = 89° 58' instead 

 of 90° 00'. While the above measurements agree very well with the 

 calculated angles, the form cannot be considered as determined, as it 

 is too rounded. It must be classed as a doubtful form. The forms are 

 shown in fig. 6, in which it is attempted to show the crystal as it 

 actually is. 



5. CALCITE FROM RHODE ISLAND 



The crystals here described were received from Mr. A. L. Ste- 

 venson of Providence, R. I., and the locality is given as Dexter Lime 

 Quarry, Lincoln, R. I. To the kindness of Mr. Stevenson in sending 

 the specimens the writer's thanks are due. The crystals are on lime- 

 stone and are associated with a pearly mineral forming almost color- 



