nth and Penfidd — Lanqfordtie, Ne9qyuKoniU^ >/<■. \\\\ 



brachypinacoid b 010 and shows in addition M in), m no. j> 

 111 and e 001. A measurement of the two /one- M, A, /// and 

 M, p, o was sufficient for a determination of the faces, which 

 when drawn in proper position represent the stalactite as lay- 

 ing «>n ir> Bide. The crystal is represented in fig. 6. where b 

 and in being to the left and behind are not Bhown. The meas- 

 ured angles are: 



Calculated. Calculated. 



M * b, 1 10 ~ OlO = 63° 30' 64° 13' M *j>, llo „ 1 [l = 39 25' 38 26' 



b ~ m, OlO * 110 = 51 9 '58 50 p^c, ill *001 a 41 30 4 4 59 

 c.6, 001*010 = 96 30 95 54 



The b face not being very perfect accounts for a rather large 



variation from the theoretical for the first three angles. It 

 was from this crystal that the smaller one was taken, No. 1, 

 which was used for obtaining the fundamental measurements. 

 It was attached at the end of the stalactite, separated readily 

 from it and had no definite crystal! ographic relation to the 

 Larger crystal. 



Xo. 5, is a short stalactite about 10 mm long and broad at- 

 tached at the base to a mass of nesquehonite crystals. Like 

 the previous stalactite the prominent face at the end is a 

 brachypinacoid b 010, with which the following forms are as- 

 sociated. M, HO; /, 1U>; h, 150; c, 001; e, 62L ; p, 111; r, 

 L§2; 8, 1t2 ; and 0, 112, which were identified by measurements 

 made in the following prominent zones M, I, b and h ; M, p 

 and c ; jk r and e\ b, s and r ; s, e and o and b, e and c. As 

 the faces intersect the negative end of the b axis the figure, 

 No. 6, has been drawn representing the crystal as turned 

 about the vertical axis so that the negative end of b is in front 

 and the positive end of a to the right. A\ r e are thus looking 

 as it were directly at the end of the stalactite. The face b is 

 in two levels separated by a narrow prismatic face h 150. The 

 angular marking at the lower left hand corner of the drawing 

 represents where a small crystal was detached. The important 

 measurements in the zones mentioned above are as follows. 









Calculated. 









Calculated. 



M*/. 



110 ^ 170 = 49° 



15' 



49° 16' 



It A. S, 



OlO* 172 = 33° 



34' 



33 24' 



M * b, 



llO^Oll =63 



30 



04 13 



S A. f, 



172 ~ 132 =26 



36 



26 14 



Uh, 



170~ 150=33 



30 



34 16 



S a 6, 



1=2 xv 021 = IS 



25 



19 2 



M * p, 



110 ^ 111 - 39 





38 26 



CaO, 



021 ~ 112=42 



26 



42 14 



P~c, 



111 *001 =44 





44 59 



b a. e, 



010*021 = 45 





44 32 



p~r, 



110 xv 132 = 21 



30 



21 41 



e /-. c, 



021 *001 = 51 



30 



51 22 



r * e, 



i: j >2^02l = 23 



52 



24 36 











On this crystal we find for the first and only time / and & 

 I gives a faint but distinct reflection and gives a measurement 

 on M very close to the calculated ; is very surely determined 

 both by its zones and the angles which do not vary much from 

 the calculated. The prism h 150 gave a poor reflection, as b, 



