230 



Penfield and Ford — Calaverite. 



fifteen terminated crystals besides numerous fragments. Some 

 of the fragments, which are portions of lath-shaped crystals 

 without terminal faces, measure over a centimeter in length 

 and breadth. The terminated crystals are quite uniform in 

 size, averaging about 5 mm in length by 3 mm in thickness. They 

 were detached from the matrix and looked as though they all 

 might have come from one cavity. Nine of them are right- 

 hand terminations, and are represented by figures 2 to 10. 

 Figure 1 gives an ideal representation of the forms observed 

 on the most symmetrically developed crystal, shown by figure 

 2. The terminal faces occurring on the nine crystals, with 

 their symbols, measured and calculated angles, and the total 

 number of times they were observed, are given in the follow- 

 ing table : 









Measured. 







Calculated 













A 









A 





Times 

 observed. 





Symbols. 



Vertical. 



Horizontal. 



Yertical. 



Horizontal. 



m 



110 



00° 



00' 



31° 



29' 



00° 



00' 



31° 



30^' 



14 



e 



42-44-11 



20 



21 



32 



10 



20 



26 



32 



1 



1, figure 3 



t 



13-20-4 



24 



5 



23 



10 



23 



38* 



23 



32* 



3 



<1 



11-29-5 



33 



4 



15 



46 



32 



52 



15 



30* 



4 



h 



21-37-11 



36 



40 



23 



19 



36 



40 



23 



30J 



2, figure 3 







13-22-10 



46 



59 



28 



2 



47 



301 



28 



18 



18 



P 



111 



54 



44 



46 



51 



54 



48 



46 



54* 



12 



i 



10-7-11 



57 



13 



58 



8 



57 



18 



58 



29 



1, figure 4 



y 



296 



76 



21 



30 



28 



76 



38 



30 



54 



5 



V 



2-11-10 



81 



52 



38 



15 



81 



48 



38 



43* 



2 



r 



10-44-15 



114 



53 



18 



27 



114 



54 



18 



10* 



10 



w 



111 



125 



6 



46 



46 



124 



55 



46 



48* 



3 



u 



il-18-10 



127 



8 



30 



55 



127 



32 



31 



28 



5 



X 



11-20-6 



141 



59 



22 



50 



142 



4 



23 



5 



2 



s 



11-62-6 



142 



25 



8 



3 



142 



4 



7 



50 



16 



z 



15-22-1 



174 



9 



22 



42 



174 



34 



22 



46 



1, figure 4 



Five of the crystals studied are left-hand terminations, shown 

 by figures 12 to 16. In order to facilitate the identification of 

 the faces figure 11 is introduced, which is a mirror image of 

 figure 1, and represents a possible symmetrical development of 

 the prominent forms. Of the sixteen forms observed on the 

 nine right-hand terminations twelve were observed on the five 

 left-hand ends, and one additional form n. The forms, 

 together with their measured and calculated angles, are given 

 in the table which follows. 



Of the forms observed on the fourteen terminations studied, 

 o is represented by 26 faces, s by 23, m by 20, p by 19 and r 

 by 13, the possible number of faces of each kind being 28. 



Although the faces in the zone parallel, to the ortho-axis were 

 generally so striated that reflections from them could not be 



