SOME CRYSTAL MEASUREMENTS OF CHILLAGITE. 



215 



Crystal No. 7. — Tiiis crystal also possessed three sides 

 which could be measured. The forms c, f and d are promin- 

 ently developed. All the other forms present possess at 

 least one good representative face. 



TABLE VIE. 



Miller 

 Indices. 



001 

 00 L 



1 1 10 

 1 18 



1 17 



1 16 



2 2 11 



3 3 16 

 1 15 



1 14 



Measured W>_ 



£c/>. 



O / O / 



1 



— 



3 



— 4 4 55 



- 



+43 39 



- 



+45 42 



- 



- 44 57 



- 



-44 51 



- 



+45 



2 



-45 



2 



-44 35 



- 



+45 10 



1 



-44 28 



- 



-44 29 



- 



— 44 35 





+45 14 



2 



+44 54 



15 



Meas 

 P 



urvd 



Bp. 



Calcul- 

 ated 



Calcul- 

 ated a. 



8<f>. 



o / 



o 



/ 



/ 





/ 









3 



— 







— 





4 



i 



— 











12 



36 





45° 



12 12 



5 



15 



10 



- 







15 7 



1 21 



15 



31 



- 







15 7 



42 



17 



16 



* 







17 10 



3 



19 



21 



2 







19 49 



9 



21 



26 



"2 







21 28 







22 



4 



2 







22 5 







23 



25 



- 







23 23 



25 



23 



29 



- 







,, 



10 



23 



57 



- 







>5 



32 



27 



56 



- 







28 23 



31 



28 



12 



- 









25 



28 



32 



- 







,, 



14 



28 



44 



- 







st 



6 



op. 





 4 



24 

 3 



24 

 6 



28 

 2 

 1 

 2 

 6 



34 



33 



11 

 9 



21 



The following table gives the mean values of <£andp and 

 their differences from the calculated values. It also shows 

 the number of faces considered in deducing these mean 

 values and the variations in their measurements. 



