STUDII SULL’ IDOCRASIA DEL MONTE SOMMA 
273 
Quadro N. 2. 
Cristallo N. 4 (I tipo), fig. 18. 
Zona [100, 110] 
Facce e loro dimensioni in decimillimetri 
Angoli delle normali 
alle facce 
Differenza 
dagli angoli 
calcolati 
(100) 
25 
(110), (100)? 45°16 / 00 // 
0 / 
+ 0 16 
(210) 
7 
(100) (HO), 43 24 00 
— 1 36 
(110) 
28 
(HO), (HO), 02 06 00 
(120) 
10 
(HO), (HO), 00 34 00 
(010) 
20 
(HO), (120) 16 09 00 
— 2 17 
(120) 
(120) (010),! 26 50 30 
-+• 0 24 
(110) 
20 
(010), (010), 00 24 00 
(100) 
14 
(010), (120), 25 37 00 
— 0 49 
(ITO) 
23 
(120), (120), 01 00 00 
(120) 
— 
(120), (HO), 18 02 00 
— 0 24 
(010) 
22 
( 1 IO;, (ITO),! 01 53 00 
(120) 
16 
(110), (110), 00 50 00 
(110) 
11 
(HO), (210),! 15 35 00 
— 1 51 
(210) 
7 
(210), (210),! 00 20 00 
(210), (100), 26 24 00 
— 0 10 
Angoli delle normali 
Differenza 
alle facce 
dagli angoli 
calcolati 
(100)i (100),! 00°17 / 00 // 
Zona [001, 110] 
(100), (210)? 26 49 00 
h- 0 15 
(001)! (111)! 37 10 30 
— 0 02 
(210) (110),! 17 45 30 
— 0 41 
(111) (331)! 29 07 30 
-t- 0 01 
(110), (110), 00 50 00 
(331) (110)o 23 45 30 
+ 0 01 
(110), (120) ! 18 12 30 
— 0 14 
(110)c (001),! 90 07 00 
-+- 0 07 
(120) (010),! 26 10 30 
— 0 24 
(001), (001),? 00 08 15 
(010) (010) 2 ! 00 40 30 
(001), (IH) ? 36 57 15 
— 0 15 
(010), (120)! 25 48 30 
— 0 46 
(IH) (331)? 29 08 30 
-4- 0 02 
(120) (110),! 18 18 00 
— 0 08 
(331), (HO), 23 41 30 
H- 0 01 
(110), (110), 00 45 00 
(HO), (001)! 89 52 00 I 
- 0 08 
