130 Genth and Penfield — Lansfordite, JVesquehonite, etc. 

 Pyramids in the four upper octants. 



Front right. 



\ in, - r 



Front left. 



JP, 111, - 1 

 q, 312, — |-3 



r, 132, — % 3 







Back right. 



y, iii, \\ 



x, 132, $-3' 

 3, 312, f-3' 



Back left. 

 n, 111, 1 

 o, 112, £ 

 p, 131, 3-3 





s, 172, - i-1 







w, 5 15 1, 15-3' 



7T, 152, f-5 





r, 12 12 21, — 



12., 

 1 1 



6 







As the thirteen crystals which were sent to New Haven offered 

 a great diversity of habit it was found necessary to study and 

 discuss each one separately. In the figures which have been 

 drawn, a mere outline of the stalactite has been given with no 

 attempt at artistic shading. In all of the drawings the flat 

 crystal faces have been lettered and can thus be distinguished 

 from the rounded stalactitic surfaces which are unlettered and 

 show throughout curved contours. After establishing the tri- 

 cliriic character and axial relation of the mineral from the 

 fundamental measurements considerable difficulty was found 

 in orientating some of the more complicated crystals ; this was 

 rendered all the more difficult as none of the crystals gave 

 very exact measurements and cleavage, luster or any decided 

 crystalline habit failed entirely, but after becoming familiar 

 with some of the principal zones in a few of the more compli- 

 cated * crystals this difficulty disappeared. It should also be 

 stated here that during the investigation no uncertain reflec- 

 tions were seen which were neglected, all of the reflections 

 were recorded and in every case they could be referred to faces 

 having rational indices and in only two cases r and w were 

 these indices unusual numbers : The zonal relations were 

 throughout very satisfactory. 



No. 2. This is a very simple stalactite about 22 mm long and 

 9 in diameter, terminated at the end by only two crystal faces 

 and with one large prominent face on the side, fig. 4. Ke- 

 flections were obtained from the faces by sticking glass plates 

 to them and the measured angles, which are not very exact, 

 indicate that the faces are probably c 001, p 111 and m 110. 

 The angles are as follows : 



Calculated. 

 CaJ), 001 ~ 111 = 42° 30' 44° 59' 



c/vw, 001 ,v 110= 77 40 78 12 



p*m, 111^110= 61 58 56 



No. 3 is a stalactite, which is very similar to the previous 

 one, and is terminated by only two faces which are probably c 

 001 and d 021, giving the measurement <?^e? = 44° 56' cal- 

 culated 44° 50'. 



No. 4 is a stalactite about 15 mm long and 8 in diameter 

 attached at the base to a mass of radiating prismatic crystals 

 of nesquehonite. At the end it is terminated mostly by a 



