364 A. J. Moses — Crystallization of Molybdenite. 



Summary of Molybdenite Measurements. 



Assuming the unit of Brown, viz., a pyramid o making an 

 angle co with the cleavage equal 65° 35' from which 6 =1*908 

 is calculated, the observations may be summed up as follows : 

 the angles with the cleavage being given. 



Basal pinacoid, c (0001), Not observed except possibly on 

 Enterprise, Ont. crystal. 



Prism, m (1010). Frankford, Pa., sometimes prominent, Aid- 

 field, Quebec, as part of striations ; Warren, N. H., traces. 



Pyramid, #(3031). Calculated angle 81° 24'. 



Observed at Frankford, Pa. Measured angle 81° 31'. 



Pyramid, p (2021). Calculated angle 77° 13'. 



r Frankford, Pa 77° 15' 



Measured angles J Aldfi eld, Quebec 77 18 



Measured angles 1 Cape Breton n 29 



^Okanogan Co., Washington 76 59 



Pyramid, r(5054). Calculated angle 70° 03'. 



Observed at Narksak, Greenland. Measured angle 70° 31 J'. 



Pyramid, o (1010). Unit angle, Frankford, Pa., 65° 35'. 



( Tilly Foster Mine 65° 29' 



Measured angles ■< Auerbach, Hesse 65 48 



( Warren, K H. 64 27 



Pyramid, t (2023). Calculated angle 55° 45'. 



The Warren, N. H., angles for this, 54° 43', and unit are rela- 

 tively close for these indices but low for the Brown unit. 



Pyramid, 5(2025). Calculated angle 41° 23'. 



tvt -, t ( Enterprise, Ontario 41° 26' 



Measured angles \ ^ r >, «tr ' v"' ' * a-, a* 



& ( Okanogan Co., Washington, 41 46 



Pyramid, w(1014). Calculated angle 28° 51'. 



On Okanogan Co., Wash., the angle 29° 54' was obtained, 

 which was near these indices for 2025 = 41° 46'. 

 Columbia University, January, 1904. 



