123 



Crystalline form. 

 The schizolite is triclinic with the elements: 



a:b:c = 1-10613 : 1 : 0-98629 



a = 90°1Г; /9 = 94° 45^/4'; у = 103° 7 V4' 



(010):(001)= 88°42';(100):(001) = 85°4'; (100) :010) = 76°49' 



For the measurings of the angles crystals of all the men- 

 tioned varieties have been used, especially the mentioned small 

 crystals from К an ge rd luar suk whose faces are rather dull, 

 but tolerably plane. The crystals from Naujakasik some- 

 times have very bright faces being in return almost always 

 faceted in different ways, so that they cannot so well be used 

 as the above mentioned ones. As it will appear from the table 

 below the separate value differs generally 1 — 2° for the same 

 edge. The values found and those calculated correspond, how- 

 ever, tolerably well with each other, so that the indices of the 

 mentioned faces being all small, may be regarded as com- 

 pletely sure. 



The following forms have been found: 



a{lOO}, 6{010}, c{00l} 



o{530), m{ll0}, p{230}, i¥{lTo}, /{l20} 



г{Г02}, w{r0l}, s {201} 



elni], g[\ll}, f{Tï\] 



determined by the following angles : 



Average 

 value 



b:c = (010):(0Ü1) = 88° 42" 



a:c = (100): (001) = 85° 4'* 



a:b = (100): (010) = 76° 49" 



o:a = (530) : (100) = 29° 8' 



m:a = (110): (100) = 41° 8' 



p:a = (230): (100) = 49° 43' 



M:a = (iTO) : (100) -= 55° 4' 



/i-a = (l70):(I00) = 76° 57' 



