22 
V 2 Mesolith (2a F b) Mesole. 
Vi do. (a F b) Mesolith. 
3 / 2 do. (2a F 3b) Poonalith. 
3 / x do. (a F 3b) Harringtonit. 
6 /i do. (a F 6b) Antrimolith. 
B-Mesolith (b) Uigit. 
7. Orthoklas. [(RR) 2 Si -b n (RR) 2 Si 3 ]. 
(Gemeiner Feldspath, Adulai-, Loxoklas, Rhyakolith, Sanidin, Weissigit, Amazonenstein.) 
Monoklinoëdrisch. C 65° 47'; oo P 118° 59'; P oc 63° 53'; P 126° 15. 
(a) = (RR) 2 Si; (b) = (RR) 2 Si 3 . R = Al; R < K. 
V 3 Oithoklas (3a 4- b) Rhyakolith. 
3 4 do. (a H- 3b) Loxoklas. 
B-Orthoklas (b) (Sanidin , Adular , Amazonenstein, 
Gem. Feldspath, Glasiger Feldspath, 
Weissigit). 
8. Anorthit. [(RR) 2 Si* -F n (RR) 2 ' Si 3 ]. 
(Cyklopit, Labrador, Hyposklerit, Chesterlith, Indianit, Amphodelit, Lepolith, Thjorsauit, Latrobit, Barsowit). 
Triklinoëdrisch mit redits geneigter Basis. oc 'P: oc P' 120° — 121°. OP: oc P oc 
fa) = (RB 
Si; 
(b) = 
(rr; 
) 2 Si 3 . 
R < Ca. 
A-, 
Anorthit 
(a) 
(Cyklopit , Lepolith , 
Anorthit). 
Vu 
do. 
(24a 
+ b) 
(Latrobit, , Amphodelit). 
% 
do. 
(12a 
+ b) 
Thjorsauit. 
1 j 
7 
do. 
(7a 
F b) 
Barsowit. 
Vs 
do. 
(3a 
F b) 
Labrador. 
v 2 
do. 
(2a 
F b) 
do. 
Vi 
do. 
(a 
F b) 
Hyposklerit. 
6 /l 
do. 
(a 
F 6b) Chesterlith. 
1 . 
Al bit. 
[(RR 
:) 2 Si 
F » (RR) 2 Si 3 ]. 
(Periklin, Olîgoklas, Andesin, Bytownit, Saccharit, Prehnitoïd). 
Triklinoëdrisch mit links geneigter Basis. oc 'P: oc P' 120" — 121°; OP: oc P 
93°— 95°. (a) = (RR) 2 Si; (b) = (RR) 2 Si 3 . R < Na. 
oc 
