SCHALLER 



The faces are seen to be in the prism zone mm' and therefore could 

 not be scalenohedrons with complex indices. 



4) meas. = 27° 34' 

 20 

 32 

 37 



<i> calc. {7.6.13.0} = 27° 27' 



Av. = 27° 31' 



This prism face is present on all of the crystals, of which but few, 

 however, are suitable for measurement. The results just given were 

 all obtained from one crystal. It seems odd that this form has not 

 been described before — at least the writer could find no mention of 

 it in the literature — as the specimens are supposed to come from a 

 locality so well known for its calcites. 



Fig. 1 



It seems hardly correct to regard these prism faces as corrosion 

 forms or some other secondary formation. While the base and prism 

 faces on these calcites are dull, they do not show any definite signs 

 of etching, and though the new prism faces are rounded, they are 

 considered as belonging to a well established form for calcite. As 

 stated, the form occurs on all of the crystals, and all twelve of the 

 faces are present on each crystal. They are shown in fig. 1. 



2. CALCITE FROM ENGLAND 



The crystals here described are from a group containing individ- 

 ual ones, the largest of which measure 4 cm. by 2 cm. The exact 

 locality is not known. The crystals have a trigonal habit due to the 

 predominance of a steep negative rhombohedron. The forms present 

 on these_crystals are: r\ 1011 | , M { 4041 | , «• | 5051 \ , y { 60(31 \ , 

 o.{ 11.0.11.2!, e{0li2|, /i0221|, ^10881}, C' {0.13.13.1 } , 



