COMMISSION GEOLOGIOUE - Arkisto.gsf.fi

30
Bulletin de la Commission geologique de Finlande N: 0 212.
Table 2. The optical properties of some blanfordites from India.
a
ß
y
2Va ..
e: a ..
Kacharwahl,
Fermor (1909)
I
Chikla, I Nagpur, 70waan l Ponia, I Tirodi, I Tirodi mine,
Bilgrami (1956) a~~Sv(r95~ir Kilpady (1960) Kilpady (1960) (thi. study)
1. 752 rose 1.732 rose 1.767 rose, \1.760 pink 1.746 yellow 1.748 rose
pink pink pink to with a tinge pinkish pink
violet of brown
1. 754 bluish 1. 756 pale -light bluish 1."168 pale 1. 74 8 brown 1. 773 violet
lilae blue
lilac pink
1. 780 sky blue 1. 770 blue 1.799 sky blue 1.780 blue 1. 768 1.788 blue
80°
72°-68°
61°
9°
5°
6°
Table 3.
X-ray powder diffraction data for some mangan-bearing minerals from
Goldongri, India. Cu-K a-radiation, 114.7 mm diameter camera.
Blanfordite
hkl I dm • as
I
Manganarfvedsollite
hkl I dm •as I
hkl
Eckermannite
i dm • as I
hkl
Piemontite
dm • as ! I
111
020
021
221
310}
311
002}
202
221
311
222
330
421
041
402
240
241
511
510
150
313
223}
312
531
403
351
6.37 8
4.43 M8
3.59 VW
3.34 W
2.989 V8
2.895 S
2.595 M8
2.462 M8
2.254 W
2.196 M
2.123 M
2.090
2.030
W
W
2.019 W
1.981 W
1.930
1.884
W
VW
1.801 VW
1.731 M
1.689 VW
1.659 VW
1.634 VW
1.608 M
1.590 W
1.528
1.504 »
1.463 VW
1.393 W
1.372
1.326
1.284
1.226
020
110
040
021}
220
131
240
310
221
330
151
061
002
350}
351
171
261
480
110
600
551
010
661}
461
9.05 W
8.43 8
4.46 M8
4.19 W
3.38 8
3.24 W
3.1 0 8
2.97 W
2.78 M
2.691 V8
2.563 W
2.523 M
2.321 W
2.259 W
2.1 56 M
2.063
1.642
VW
W
1.624 VW
1.600 »
1.578 W
1.510 »
1.484 VW
1.423 W
1.336 VW
1.280
020
110
200
040
220
131
131
240
310
221
330
151
061
002
351
171
171
261
351
190
510
512
480
1110
552
012 0
442
661
9.05
8.43
4.88
4.46
4.13
3.82
3.38
3.27
3.12
2.941
2.797
2.699
2.571
2.515
2.316
2.265
2.196
2.156
2.054
2.007
1.945
1.896
1.676
1.645
1.629
1.598
1.576
1.524
1.504
104 88
1.429
1.397
1.367
1.336
1.305
1.282
1.043
W
M
W
M8
W
W
8
M8
8
W
M
V8
W
M
W
W
VW
M
VW
»
W
VW
W
VW
M
VW
»
W
W
100
101
002
200
211
102
112
020
013
211
202
121
310
222}
212
122
403
014 +
023
203
400
213
123
420 +
435
433
8.05
5.07
4.60
4.00
3.49
3.43
2.912
2.840
2.682
2.600
2.536
2.475
2.417
2.309
2.176
2.156
2.123
2.085
2.049
2.002
1.922
1.8 1
1. 828
1.653
1.634
1.588
1.539
1.459
1.419
1.395
1.363
1.299
1.240
1.222
1.175
1.160
1.134
M
M8
VW
M8
M8
W
V8
M
8
8
M
W
8
111
W
W
M
W
VW
VW
VW
M8
VW
»
M8
M
M
111
M
M
VW