WHITLOCK. — CRYSTAL FORMS OF CALCITE. 341 



H (6395) = (20-2-7). This scalenohedron was recorded by Whit- 

 lock 123 on crystals from West Paterson, N. J. In the combination 

 cited (Type II) this form is present in zone [0001 : 2130] with (8_-4- 

 12-5), (0001) and (4261). The form also falls in zone [4047 : 1120]. 

 It may be regarded as fairly probable. 



G (10-7-17-9) = (12-2-5). This scalenohedron was simultane- 

 ously observed in 1897 by Butgenbach 124 on crystals from Cumber- 

 land, and by Moesz 125 on crystals from Korosmezo, Hungary. In 

 addition to the evidence of two observers, this form presents better 

 zonal relations than the preceding and is referable to normal series 

 N5. It should be classed as probable. 



I-(17-38-55-24) = (32-15-23). This scalenohedron was observed 

 by Palache 126 on crystals from the Lake Superior region of Michigan. 

 The form which was observed twice was developed to an appreciable 

 habit on one crystal but as observed by Palache its occurrence at 

 this locality is exceptional and under ordinary condition the form 

 would be vicinal, probably to (2573). 



to (3-24-27-7) = (37-28-44). This scalenohedron was recorded 

 by Morton 127 on crystals from Bamle, Norway. In the combination 

 described by Morton the form occurs with (3257) and (OlIO) in a fairly 

 well marked zone. It is noteworthy, however, that the hypothetical 

 indices (4-31-35-9) = (19-12-16) fall very close to the position 

 assumed by Morton and offer much better zonal relations. The 

 form is somewhat doubtful. 



In the course of the preceding analysis the following tentative sub- 

 stitutions have suggested themselves as offering better zonal relations, 

 as falling in relatively low normal series and as being expressed in 

 simpler Bravais and Miller indices. In every case the difference in 

 <p and p value between the questioned and substituted pole is well 

 within the limit of ordinary fair observation. 



E (32-56-88-69) = (61-31-25). This scalenohedron was substi- 

 tuted by Palache 128 for the form (21-35-56-44) = (71-58-47), 

 described by him on one crystal from Lake Superior, Mich. Neither 

 form falls in any of the zones discussed, nor are they tied by zonal 

 relations to any of the knot poles of the calcite network. The hypo- 



123 Whitlock, H. P., Am. Jour. Sci., 24, 426 (1907). 



124 Butgenbach, H., Soc. Geol. Belg. Ann., 24, 66. 



125 Moesz, G., Fold. Ivozlony, 27, 495. 



126 Palache, C, loc. cit. 



127 Morton, C, Stockh. Of vers., 65 (1884). 



128 Palache, C, loc. cit., Fig. 5. 



