 ,  142
 149 199
 149
 149
 210
 149
 149
 270
A.R. of four tautozonal faces 87 563
A.R. of four zone-circles 103
A.R., determination of angles by 97
A.R., determination of face-symbols by 93
A.R., different arrangements of two known angles in 100
A.R., transformations to cosines and cotangents 101
Acleistous 197
Acleistous, dihexagonal class 451 426
Acleistous, ditetragonal class 268 225
Acleistous, ditrigonal class (rhombohedral) 418 344
Acleistous, hexagonal class 443 426
Acleistous, pyramid 205
Acleistous, pyramidal class (prismatic) 209 197
Acleistous, tetragonal class 254 224
Acleistous, trigonal class (rhombohedral) 350 344
Acute bisectrix 142
Adjacent octants 299
Adularia 532
Airy's spirals 417
Albite 543
Albite-law of twinning 544
Alstonite 501
Alternate octants 299
Alum 4 7 332
Amazon-stone 546
Amethyst 523
Amphibole 530 181
Analcime 309
Analogous pole 175
Analytical methods 557
Anatase 251
Andesine 547
Angle between two lines 566
Angle, dihedral 8
Angular elements 161 183 212 231 348
Anharmonic ratio see "A.R."
Anorthic crystals, drawing 61
Anorthic crystals, optical characters 144 145
Anorthic system 148 138
Anorthic system, formulae 161
Anorthic system, twins 543
Anorthite 157 548 74 84 94
Antilogous pole 175
Antistrophic 21
Apatite 448 19 442 527
Apophyllite 251 248
Aragonite 498 208
Arsenopyrite 507 207
Asparagine 204
Attached crystals 4
Auxiliary rhombohedron 387 393
Axes of reference 23
Axes of reference, symmetry see "Symmetry-axes"
Axes of reference, to be zone-axes 562
Axes of reference, transformation of 104 560
Axial planes 23
Axial points on sphere 76
Axinite 106
Axis, optic 141
Barium, nitrate 327
Barium-antimonyl dextro-tartrate 259
Barium-antimonyl dextro-tartrate + potassium nitrate 460
Barytes 208 20 46 50 53 59 71 85 96
Basal pinakoid 202
Base 202 345
Bauer, M. 496 555
Baveno-twins of orthoclase 532
Bertrand, E. 478 506
Beryl 456
Biaxal crystals 141
Bipyramid 205
Bipyramid, dihexagonal 456
Bipyramid, ditetragonal 246
Bipyramid, ditrigonal 425
Bipyramid, hexagonal 400 448
Bipyramid, tetragonal 230
Bipyramid, trigonal 410 422 425
Bipyramidal class (prismatic) 205 197
Bipyramidal class (tetragonal) 225
Bisectrices, optic 142
Bisphenoidal class (prismatic) 197
Blende 338 470
Boracite 339
Borax 143 145 181
Bournonite 207 498
Brachy-axis 198
Brachy-diagonal 198
Brachy-dome 201
Brachy-pinakoid 202
Brazil-twins of quartz 521
Brewster, D. 140
Brookite 207 219
Calcite 405 514 5 11 147 398
Cane-sugar 176
Carangeot's goniometer 589
Carlsbad-twins of orthoclase 536
Cassiterite 248 482 30 59
Celestine 208
Centre of symmetry 15
Centro-symmetry 16
Cerussite 502
Cesaro, G. 90 510
Chabazite 526
Chalcocite 509
Chalcopyrite 240 492
Chrysoberyl 507
Cinnabar 417 525 146
circular polarization 146
Circular polarization, cubic 301 326
Circular polarization, hexagonal 446 459
Circular polarization, oblique crystals 175
Circular polarization, prismatic 204
Circular polarization, rhombohedral 359 415 523
Circular polarization, tetragonal 259 267
Circular polarization, twin-crystals 480 523
Cleavage 1 11
Clinographic drawings 65 49
Clinohedral class (oblique) 177
Clinohedrite 178
Closed form 230
Co-polar edges 360 427
Co-polar faces 427
Cobaltine 333
Coign 17
Combination of forms 150
Combination-plane of twin-crystals 462
Combinations 202
Complementary forms 148 180
Complementary twins 463 477
Composite crystals 461
Constancy of angle 10
Constituent molecules 11
Contact-goniometer 589
copper 308 471
Copper, pyrites 240 492
Cordierite 208
Corrosion of twin-crystals 465
Corrosion-figures 147
Corundum 403
Crossed dispersion 144
Crystal, definition of 1
Crystallization 3
| Crystallographic axes 23
Crystallometric angles 21 121
cube 285 314
Cubic coigns, edges and faces 285
Cubic crystals, drawing 55 340
Cubic crystals, optical characters 140
Cubic planes of symmetry 303
Cubic system 275 139
Cubic system, formulae 283
Cubic system, symmetry-axes 132 276 311
Cubic system, twins 466
Cuprite 302
Curie (J. & P.) 135 147 332
Cyanite 155 554 62
Cyclical order 291
Cyclograph 158
Czapski, S. 601
Dana, E.S. 510
Dana, J.D. 509 538
De l'Isle (Rome) 10 461 589
Deltoid dodecahedron 321 334
Derivative forms 10
Des Cloizeaux, A. 146 177 190 193 252 502 539 546
Development, equable 6 22
Development, unequable 6 8 22
Dextro-tartaric acid 176
Dextrogyral 176
Dextrogyral, twins of quartz 519
Diacetyl-phenolphtalein 268
Diametral zones 79
diamond 337 467 468 481
Dihedral angle 8
Dihedral pentagonal dodecahedron 316
Dihexagonal prism 345 369 452
Dihexagonal-bipyramidal class 426
Dihexagonal-pyramidal class 426
Dimetric system 139
Dioptase 362
Diplohedral 15 205
Diplohedral, dihexagonal class 455 426
Diplohedral, ditetragonal class 243 224
Diplohedral, ditrigonal class (cubic) 275
Diplohedral, hexagonal class 448 426
Diplohedral, tetragonal class 260 225
Diplohedral, trigonal class (cubic) 275
Diplohedral, trigonal class (rhombohedral) 360 344
Direct and inverse rhombohedra 378
Direction-ratios of line 564
Direction-ratios of zone-axis 559
Dirhombohedral forms 357 439
Dispersions of optic bisectrices 143
Disphenoid (tetragonal) 233
Ditetragonal prism 228
Ditetragonal-bipyramidal class 224
Ditetragonal-pyramidal class 225
Ditrigonal bipyramidal class (rhombohedral) 424 345
Ditrigonal coign 292 289
Ditrigonal prism 410 419
Ditrigonal pyramidal class (rhombohedral) 344
Ditrigonal scalenohedral class (rhombohedral) 344
Dodecahedral planes of symmetry 303
Dodecahedron, deltoid 321 334
Dodecahedron, dihedral pentagonal 316
Dodecahedron, rhombic 286 315 334
Dodecahedron, tetrahedral pentagonal 324 343
Dolomite 514
Domatic class (oblique) 177
Doublet 464
Drawing crystals 48
Drawing cubic crystals 340
Drawing implements 67
Drawing reduction of scale 68
Drawing rhombohedral crystals 371 376
Drawing twin-crystals 468 486 517
Dufet, H. 196
Dyad axes 19 113 134
Dyad axes in cubic system 278
Dyad axes, conditions for 111
Dyakis-dodecahedral class (cubic) 328 275
Dyakis-dodecahedron 329 341
Edge, possible 2
Electrical phenomena 146 see
Elements of a crystal 29
Elements of symmetry 21
Elements of symmetry, relations between 108
Enantiomorphous 146 149 see
Epidote 193 181
Epsomite 202
Equable development 6 22
Equations to normal 29 567
Equatorial axes 430
Equatorial plane 365 427
Error of centering 591 597
Erythroglucine 261
Esmarkite 551
Ethylene-diamine sulphate 267
Euler's theorem of rotations 123
Eulytine 477
Face, common to two zones 43 559
Face-angle 9
Face-symbol 27
Faces 1
Fahlerz 339 473
False faces 2
Felspars see "Orthoclase"
Felspars, plagioclastic 543
Fletcher, L. 491 493 495
Fluor 309 474
Foote, H.W. 178 420 542
FORM 21
Form-symbol 28 149
Formation of crystals 3
Forms, closed 230
Forms, complementary 148 180
Forms, open 179
Forms, special and general 173
Fresnel's wave-surface 141
Fuess' goniometers 597 601
Fundamental pyramid 349 585
Fundamental rhombohedron 361
Gadolin, A. 119
Galena 467 472 307
Garnet 310 8 17 307
Gauss, J.K.F. 90
General forms 174
Glaucodote 507
Gold 467 307
Goldschmidt, V. 601
Gonioid class (oblique) 177
Gonioids 210
Goniometer, horizontal-circle 597
Goniometer, reflexion 590
Goniometer, signals 593 599 602
Goniometer, three-circle 604
Goniometer, vertical circle 592
Goniometer-adjustments 594 600 602
Goslarite 203
Grassmann's method of axial representation 581
Greenockite 420
Groth, P. 269 359 480
Guanidine carbonate 267
Gypsum 186 529 143
Habit 5
Haidinger, W. 55 241 493 515
Harmonic ratio 108
Harmotome group 539
Hauey, R.J. 10 461 589
Haueyne 481
Heat, effect on crystal-elements 247 347 484
Heat, effect on optical characters 145 189 192
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