Über Volumen und Oberfläche der Krystalle- 511 



1. Triclinisches System 



Oi[hkt]= 2^ 1/ [(c^-\-b^— 2 bckl cos £)(c2h*+a*l*—2ach{co*r,) 

 — (ctfik+abl* cos £ — acklcosr, — bchlcos£) 2 ] 



K [hkq - ^| o, [Mq 



2. Monoclinisches System 



3 [AH] = 9777; 1/ [0 2 *; 3 +ö 2 / 3 ) ( C 3/ i3 + a3 ; 3 _2«cÄ^ cos vi) — 

 — {c~hk — ac kl cos r ; )2] 



3. Prismatisches System 

 3 [hkl] = -|p- U [(^+6*) (c*h*+a*l*) - O a Ä*) B ] 



4. Orthohexagonales System 



°* ^ ^ TW*]/ [(^ a +« 2ia )(^ a +3a^ 3 )— «**»] 



n[Mq = ^o 4 [Mq 



5. Pyramidales System 



05 [«q = äWal/ [( caÄa +« 3 ^( c8Äa H- fta?a )— c * Äa * a ] 

 r 5 [A*q = yw 5 ° 5 [M/] 



6. Tesserales System 



° 6 [M/] = 2l*P V [(A " J+ ^ (/i3+ ^ " ^ 

 F 6 [Atf] = ^ 0« [hkl] 



Sitzb. d. roathem.-naturw. Cl. L. Bd. I. Abth. 35 



