WHITLOCK.— CRYSTAL FORMS OF CALCITE. 337 



[O-lMl-4 : 11-0-TT-2] and [0221 : 3140]. It should be classed as 

 probable. 



Y (12-32-44-13) = (23-11-21). This scalenohedron was observed 

 by vom Rath 113 on crystals from Bergen Hill, N. J. Irby includes it 

 in his list without comment as does also Goldschmidt. In spite of the 

 high normal series to which the form is referable it falls at_the inter- 

 section of the zones [0221 : 2130], [1431 : 4041] and [4132 : 0551] 

 The form is probable. 



B (12-40-52-11) = (25-13-27). This scalenohedron was observed 

 by Palache 114 on two crystals from the Lake Superior region of Michi- 

 gan. On the combination figured itis present as narrow face. It 

 marks the intersection of the zone [0551 : 4041] and is referable to the 

 same normal series as the preceding form. The form is not as prob- 

 able as those of this zone previously discussed. 



Scalenohedrons of the Zone [1123 : 1341] = [210 : 212], 



Symbol t" 



Like the preceding, this zone is oblique to the directions of the zonal 

 network. As limited in the present discussion it contains two knots 

 of the zonal network and extended beyond (1123) it includes (0111) the 

 most important pole of the system. Developing the fragment be- 

 tween (1123) and (1341) we have: 



Referred to N3 this zone fragment is incomplete, specially as to the 

 higher members of the series, and contains the extra forms § and 5, 

 the latter of which has already been discussed. 



X(5-13-18-7) = (10-5-8). This scalenohedron was recorded by 

 Levy. 115 In commenting on this form Irby points out that the sub- 



113 Vom Rath, G., Zeit. f. Kryst., 1, 604 (1877). 



114 Palache, C, loc. cit„ Plate XIV, fig. 17. 



115 A. Levy, loc. cit., Fig. 138. 



