Penfield and Ford — Calaverite. 



243 



It is not claimed that the results as set forth in the present 

 communication furnish an explanation of the crystallization of 

 calaverite. They are presented rather as an accumulation of 

 data which has enabled us to figure and, to a certain extent at 

 least, to describe the crystals, as also to point out close similar- 

 ities in axial ratios and twinning between calaverite and syl- 

 yanite, which, if wholly accidental, are certainly remarkable 

 coincidences. Although our results may not be conclusive nor 

 wholly satisfactory, they are presented in such shape that 

 others may make use of them in formulating any theories they 

 may entertain concerning the crystallization of this remarkable 

 mineral. 



For convenient reference all of the forms which have been 

 recorded in the foregoing pages are shown in stereographic 

 projection, figure 30, and are given in the following tables, 

 together with their calculated two-circle angles : 









Terminal Forms. 











Symbols. 



Vertical. Horizontal. 





Symbols. 



Vertical. 



Horizontal. 



b, 



010 



00°00' 0()°00' 



ffx> 



10-15-22 



71°36' 



52 c 38' 



?n, 



110 



00 00 31 30^ 



9, 



4-7-10 



74 7 



52 22 





j 17-40-2 



9 30 14 28^ 



y, 



296 



76 38 



30 54 



/*> 



\ 33-80-4 



9 47^ 14 24 



«, 



2-11-10 



81 48 



38 43^ 





j 4 4 1? 



19 3o" 33 5 



h 



10-32-21 



108 18 



31 6" 



e -> ' 



( 42-44-11 



20 26 32 1 



r, 



10-44-15 



114 54 



18 10j 



t, 



13-20-4 



23 38^ 23 32^ 



to, 



111 



124 55 



46 48+ 



g, 



11-29-5 



32 5 



2 15 30^- 



u, 



11-18-10 



127 32 



31 28^ 



h, 



21-37-11 



36 40 23 30| 



h 



756 



129 11^ 



53 31 



CO, 



20-15-12 



40 26 47 8 





11-20-6 



142 4 



23 5 



o, 



13-22-10 



47 30| 28 18 



s , 



11-62-6 



142 4 



7 50 



n, 



11-14-10 



52 12" 38 m 



s l> 



2-11-1? 



144 28 



7 47 



P, 



111 



54 48 46 54| 



V, 



2-10-1 ? 



144 28 



8 33 



h 



10-7-11 



57 18 58 29^ 



T, 



31-38-11 



153 8 



29 14 



Tj 



22-18-27 



60 5 56 31 



z, 



15-22-1 



174 34- 



22 46 



/, 



112 



70 29 61 40 



P> 



44-21-2 



176 18 



52 9 









Forms in the Zone 



100-001. 







Symbols. Vertical. 



Symbols. Vertical. 



S 



ymbols. 



Vertical. 



a, 



100 00° 00' 



G, 13-0-10 47 



301 



N 



l5 Tl-0-6 



142° 4' 



B„ 



9 1 8 



59£ 



D, 304 62 



4 / 



N 



, 2 1 



144 28 



B„ 



17-0-2 9 



30 



H, 5-0-11 71 



36 



N 



9 , 24-0-11 



146 47 



B, 



801 10 



H 



I, 2-0-11 82 



25 



P, 



11-0-2 



165 28 



B„ 



75-0-11 11 



48 



c, 1 89 



47| 



F l 



, 25-0-4 



167 9 



c, 



501 15 



53| 



L, 104 99 



45 



R 



901 



171 



c„ 



401 19 



35 



M^ 9-0-10 122 



8 



R 



, li-o-i 



172 34 



E, 



11-0-4 27 



21 



M, 101 124 



55 



R. 



, 15-0-1 



174 35 



F, 



11-0-5 32 



52 



M_,II-0/lC 



) 127 



32 









