Sitzungsberichte der
Heidelberger Akademie der Wissenschaften

Numerische Apertur und Winkel der optischen Achsen. (A.5) 11

ß
2 V
^ ' a
2 V.
Ua
u.
Kaolingruppe:
83.
Kaolin.
1.563
+ 68°
-112°
0.874
1.296
84.
Nontronit .. . . Min.
>1.595
-34°
+146°
0.466
1.525
Max.
gr.
gr.
85.
Karpholith.
1.627
-66°
+114°
0.886
1.368
86.
Kornerupin (Prismatin) Min.
1.677
8°
+172°
0.117
1.673
Max.
-38°
+142°
0.546
1.586
87.
Lavenit.
1.750
-80°
+100°
1.125
1.341
88.
Lawsonit.
1.669
+ 84°
-96°
1.117
1.240
89.
Lazuüth.Min.
1.632
-61°
+119°
0.809
1.406
Max.
-69°
+111°
0.924
1.345
90.
Lievrit.
1.89
?+31°
?—149°
?0.505
?1.821
91.
Lotrit.
1.67
—
—
—.
—
92.
Molengraai'fit.
+ 28°
-152°
0.421
1.688
93.
Monazit.
1.797
+ 20°
-160°
0.311
1.770
Mosandritgruppe:
94.
.lohnstrupit .
1.546
+ 70°
-110°
0.887
1.266
95.
Mosandrit.
1.649
+ 74°
-106°
0.992
1.317
96.
Rinkit.
1.668
+ 45°
—135°
0.638
1.541
Olivingruppe:
97.
Fayalit .
1.864
-50°
+130°
0.788
1.689
98.
Forsterit.
1.659
+ 86°
-94°
1.131
1.213
99.
Monticellit.
1.662
-75°
+105°
1.012
1.319
100.
Olivin.
1.679
ca. 90°
ca. 90°
1.187
1.187
101.
Prehnit.
1.626
+ 69°
-111°
0.921
1.340
Pyroxengruppe:
102.
Enstatit.
1.659
+ 69°
—111°
0.940
1.367
103.
Bronzit.
1.669
ca. 90°
ca. 90°
1.180
1.180
104.
Hypersthen.
1.702
-50°
+130°
0.719
1.543
105.
Diopsid.
1.676
+ 59°
-121°
0.825
1.459
106.
Diallag.
wieDiopsid
wie Diopsidu.kleiner
ca. 0.825
ca.1.459
107.
Magnesiumdiopsid ....
1.685
+ 21°
—159°
0.307
1.657
108.
Hedenbergit.
1.737
+ 60°
-120°
0.869
1.504
109.
Augit.
1.704
+ 60°
—120°
0.852
1.476
110.
Titanaugit.
?
<4 60°
>-120°
<0.852
>1.476
111.
Agir in augit.
1.687
—
—
—
—
112.
Ägirin(Akmit).
1.799
-62°
+118°
0.927
1.542
113.
Urbanit.
.—.
—
—
—
114.
J adeit.
1.654
+ 72°
—108°
0.972
1.338
115.
Spodumen . . . . Min.
1.675
+ 54°
—126°
0.760
1.492
Max.
+ 68°
-112°
0.937
1.389
116.
Sapphirin.
1.709
-69°
+111°
0.968
1.408