64 NEW YORK STATE MUSEUM 
developed to the extent of a crystal habit. The positive rhombohedron 
n.(5051) occurs as a series of narrow faces beveling the obtuse polar 
angle of the scaienohedron ©: (14.2.16.3). Two negative rhombohedrons 
y (0554) and & (0443) appear as slightly developed forms lying between 
the negative rhombohedrons ¢: (0221) and 38.(0112) sometimes the one 
form being present and sometimes the other. Both of the forms were 
noted, however, on one of the crystals measured, indicating the presence of 
both forms on the type. The negative rhombohedron 9¢: (0221) is present 
as a well developed form, emphasizing, as in the case of type II the zone 
[1011.0221]. The negative rhombohedron 3: (0112) is occasionally present 
as a series of narrow faces. 
Scalenohedrons. A series of positive scalenohedrons in the zone 
[4041.1120] is developed as a series of large and brilliant planes constitut- 
ing some of the dominant forms of this habit. The scalenohedron 
S$: (6281) in this zone is here represented in medium development and the 
rare scalenohedron © (14.2.16.3) is represented by a series of narrow and 
somewhat roughened faces beveling the edges between (4041) and (6281). 
This latter form was found by Cesaro' on the calcite crystals from Rhisnes 
and by Palache” on those from the copper mines of Lake Superior. 
The new positive scalenohedron { (39.15.34.8) is found on crystals of 
this type developed to a considerable habit. The faces of this scaleno- 
hedron which are smooth and bright admitted of measurement to a con- 
siderable degree of accuracy and despite the somewhat complex indexes 
the form appears to be established beyond question. 
The common scalenohedron K:(2181) here appears as a form of com- 
paratively small development. It is, however, important as marking the 
intersection of the zones [4041.0221], [1011.1120] and [0441.8.8.16.3.4.6.10. 1]. 
The negative scalenohedron q: (2461) and 8: (4.6.10.1) noted under 
type II are also present on this type, though in somewhat smaller develop- 
ment. The combination representing this habit is shown in figure 4. 
1 Cesaro; G2 S0cs Geoly Belen Anne oS OamemlOra2 9 
2 Palache, C. Geol. Sur. Mich. 1900. 6: 2:168. 
