

132 Genth and Penfield — Zansfordite, JVesquehonite, etc. 



OiO also reflected poorly the angle of A on I was taken for the 

 identification of h. The angle varies 46' from the theoretical 

 but considering the poor reflection of the signal and that this 

 same form was identified on two other crystals we feel very 

 sure that we have given to h the proper indices. A second 

 faint reflection was obtained from a face 3° from h and corres- 

 ponding nearly to 160 but* the measurement is not very exact 

 and the form does not occur on any other crystals, so that we 

 do not feel warranted in numbering this among our list of 

 planes. 



No. 6 is like an incrustation or very short stalactite covering 

 the ends of a cluster of radiating nesquehonite crystals. The 

 incrustation is terminated by a very prominent brachypinacoid 



b, 010, measuring 9 by Y mm with which the following forms are 

 associated, m, 110; M, 110; A, 150; d, 021; e, 021; c, 001; 

 p, HI and 111 and r, 135 ; figure 7 represents the arrangement 

 of the faces on this crystal. The large b face is in three levels 

 separated by narrow m, p and d faces. At the back of the 

 crystal we find a zone of three small faces p, r and e indicated 

 by dotted lines, as e is reduced almost to a line, in one projec* 

 tion it does not show on any of the figures except the basal 

 projections. As we usually have on these stalactites only the 

 faces* corresponding to one end or corner of a crystal it is 

 seldom that we have two parallel faces as the pyramid p 1U 

 and III in this example. In the following table will be found 

 the angles which were measured in the prominent zones for 

 the identification of the faces. 



Calculated. Calculated. 



b aM, 010aI10=64° 64° 13' p a c, ill a 001=44° 15' 44° 59' 



b*m, 010 a 110=59 30' 58 50 M ~ p, 110 a 111=39 4 38 26 



m~ h, 110 a 150=38 15 39 31 p ~ r, 111 a 132 = 21 43 21 41 



b* d, 010 a 021=39 30 39 16 r* e, 132 a 021 = 24 24 35 



d* c, 021a 001=44 30 44 50 



No. 7 is a small fragment of a stalactite about ll mm in its 

 greatest diameter. The faces which are present are represented 

 in about their natural development in fig. 8. Crystal faces are 

 present only in the front, lower and right hand part of the crystal. 

 The following forms were present: c, 001 ; b, 010; m, 110; 7c, 

 310; M, 110 and U0 ; g, 312; s, 123 ; y, Hi; x, 152; n, 111; 

 o, 112, e, 021 and p, ill. The prominent zones which were 

 measured for the identified of the faces are as follows: 5, m, 

 h and M ; m, s, y and x ; m, n and o; z, k and M, q and p and 



c. The measured angles are as follows : 



b^m, 010 /v 110=64° 

 m* k, 110 ^ 310=37 32' 



&aM, 310 a 110=19 17 

 Wa z, 1H) a 312 = 55 40 



2a y, 312 a llT=19 45 



y ,, x, 111 ~ 132=24 



alcu 



lated. 









Calculated 



64° 



13' 



m a h, 



110 a lll=45 c 



27' 



44° 37' 



38 



2 



111 A 0, 



110 a 112=68 



45 



68 5 



18 



55 



k a z, 



310 a 312 = 37 





35 29 



53 



22 



k a q, 



310 a 312=30 



23 



29 59 



20 



8 



M a jo, 



110 a111 = 39 



15 



38 26 



25 



6 



P~ c, 



111 a 001=44 



37 



44 59 



