WHITLOCK. — CRYSTAL FORMS OF CALCITE. 335 



point in zone 4. Splitting at this point we have for the recorded forms 

 in the first fragment: 



Referred to N3 this zone fragment is incomplete and contains the 

 extra forms § and 3, of which the latter has been discussed under zone 2. 



A (6 -14 -20 -7) = (11-5-9). This scalenohedron was observed by 

 Palache 108 on a single crystal from the Lake Superior region. On the 

 combination cited it occurs in the zone under discussion which is here 

 marked by (0221) and (6281). It also lies in zone with (3584) and 

 (1341) both present on the combination, and falls in normal series N5. 

 The form is probable. 



The following forms have been recorded between (3251) and (lOlO) 



Referred to N 3 this zone fragment is complete up to the term 1 and 

 contains the extra form ^y. 



G (16-10-26-5) = (47-I-31). This scalenohedron was observed 

 by Johansson 109 on crystals from Norberg, Sweden. The form occurs 

 on a somewhat complex combination (Type 3) close to the poles (3251) 

 and (19-13-32-6) of zone 4. It should be classed as rather doubtful. 



Scalexohedrons of the Zone [1102 : 4047 : 1780] = [101 : 511 :325] 



k 

 Symbol , * 



Although oblique to the zone directions laid down in Plate I this 

 zone is particularly well marked and is further emphasized by the fact 



108 Palache, C, loc. cit., Plate XII, Fig. 6. 



109 Johansson, K., Geol. Foren. Forh., 14, 49 (1892). 



