VI. Ordnung: Triklinoëdrische. 
I. Gruppe: (Al 1 SP + n AI" Si 3 ). 
1. Disthen. 
(Cyanit, Rhatizit, Sillimannit, Monrolitli.) 
OC P OC : Ct P OC 106° 15'; O P : oo P x 100° 50'; O P : oc P oc 90° 15': 
cc 'P : oc P' 97° 6'. Spaltbar ccPx vollkommen; oc P oc weniger vollkommen. 
Farblos, blau, grau, nelkenbraun. H. 5 — 7. G. 3,5 — 3,7. (a) — ÂP SP; 
(b) = Al 2 SP. 
Berechnet. Gefumlen. 
"A 
Disthen (3a + 2b) 
li 
1 
Si 
0,62 
R 
1 
Si 
0,59 
Cyanit, St. Gotthardt. Arfvedson. 
(lo. 
do. 
do. 
•n 
77 , 
1 
0,61 
do. Rbraas. Erdmann. 
do. 
do. 
do. 
V 
77 
1 
0,63 
do. do. Marignac. 
do. 
do. 
do. 
7) 
77 
1 
0,64 
Sillimannit, Connecticut. Connel. 
7i 
do. 
(a 4- b) 
1 
0,66 
1 
0,66 
do. do. Stoff. 
do. 
do. 
do. 
77 
77 
1 
0,66 
do. do. Norton. 
do. 
do. 
do. 
77 
77 
1 
0,66 
Cyanit, St. Gotthardt. Arfvedson. 
do. 
do. 
do. 
77 
77 
1 
0,68 
do. Greiner. Jacobson. 
do. 
do. 
do. 
77 
77 
1 
0,68 
Monrolitli, Monroe. Smith und Brush. 
do. 
do. 
do. 
77 
77 
1 
0,70 
Cyanit, Tyrol. Erdmann. 
7i 
do. 
(a + 4b) 
1 
0,83 
1 
0,81 
Sillimannit, Connecticut. Muir. 
do. 
do. 
do. 
77 
77 
1 
0,82 
Cyanit, St. Gotthardt. Vanuxem. 
do. 
do. 
do. 
77 
77 
1 
0,83 
Sillimannit, Connecticut. Boden. 
do. 
do. 
do. 
77 
77 
1 
0,86 
Cyanit, Airolo. Klaproth. 
B- 
Disthen 
(b) 
1 
1,00 
1 
0,97 
Sillimannit, Connecticut. Thomson. 
VII. Ordnung: Unbestimmte. 
I. Sippe: K r*y stallinisclie Silicate von 11. 
I. G r u p p e : (Al 4 Si 5 + 2 H). 
1. Worthit. 
Kbrnige und verworren kurzstanglige Aggregate. Weiss, grau. H. 7. G. 3,0. 
ÂP SP + 2 44. Peterhof. Hess. 
