93 NEW YORK STATE MUSEUM 
of specular hematite occur on one specimen associated with and evidently 
of the same generation as the calcite crystals of type I. 
Type I [fig. 1, 2]. Crystals of this type are characterized by a pris- 
matic habit developed to the extent shown in figure 1, terminated by the 
common negative rhombohedron 3%. (0112). A positive scalenohedron of 
the zone [1011.1120] modifies the solid angles in the positive sextants. 
The measured angles of this scalenohedron differ shghtly from those of the 
common form P:(3251). This difference, although small, is sufficiently con- 
stant and consistent as to indicate a new scalenohedron in this zone having 
the symbols R®4 = (29.19.48.10). The presence of a scalenohedron so near 
R5 appears so irrational that the series of measurements upon which this 
contention is based is herewith appended for comparison together with the 
calculated angles for the assumed form and for those nearest to it in zone 
poms ala ke i leak ih Il 
MEASURED CALCULATED 
R24 = (29.19.48.10) IRS) == (BZ) R14 (17.11.28.6) 
(e)} ? ) / fo) 7 ° /? 
44 50 44 55 45 32 44 28 
AAG 
44 52 
Anigler 1/7 lawicatl ental 0 
ie BW) 
14 58 
14 59 
IS 
I @ 15 13 14 38 17 30 
IS) 13 
15 14 
1h) = ll 
5), Bae 
13 36 
