Sodium chlorate 327 480
Sodium lithium sulphate 420
Sodium periodate 359 463
Sodium potassium dextro-tartrate 203
Spangolite 147 420
special forms 173
Sphenoid 199 231 270
Sphenoidal class (oblique) 175
Sphenoidal class (prismatic) 197 198
Sphenoidal class (tetragonal) 225 270
Sphenoidal-hemihedral class (tetragonal) 224
Sphenoidal-tetartohedral class (tetragonal) 225
Sphere of projection 76
Spinel 446 307
Staurolite 509
Steno, N. 9
Stereo-isomers 176
Stereogram 79
Stereographic projection 76
Striae 2 465
Strontium nitrate 327
Strontium-antimonyl dextro-tartrate 446
Structure of crystals, Hauey's theory 10
Structure of crystals, uniformity of 134
Struvite 211
Strychnine sulphate 268
Succin-iodimide 269
Sugar, cane- 176
Sulphur 207
Supplementary twins 477
Symmetric twins 462 463 493 522
Symmetry 15
Symmetry, Centre of 15
Symmetry, conditions for 110
Symmetry, cubic 303
Symmetry, dodecahedral 303
Symmetry, least angles between 117
Symmetry, relations and conditions 108
Symmetry-axes 18
Symmetry-axes in cubic system 276 311
Symmetry-axes of odd degree 112
Symmetry-axes, angles between 281
Symmetry-axes, combinations of 124 128 130 276
Symmetry-axes, conditions for 110
Symmetry-axes, dyad see "Dyad"
Symmetry-axes, hexad see "Hexad"
Symmetry-axes, intersections of symmetry-planes 126
Symmetry-axes, perpendicular to n-fold axis 128
Symmetry-axes, possible 121
Symmetry-axes, tetrad see "Tetrad"
Symmetry-axes, triad see "Triad"
Symmetry-axes, uniterminal 132 see
Symmetry-planes 17
systems 138
Tartar-emetic 203
Tartaric acid 175
Tartrates 203 259 446 447 460
Tautomorphous 210
Tautozonal faces 20 38 87 559
Tetartohedral 16 149 180 259
Tetartohedral class (cubic) 275
Tetartohedral class (rhombohedral) 344
Tetrad axes 19 120 127 131
Tetrad axes in cubic system 276
Tetrad axes, conditions for 111
Tetragonal crystals, drawing 59 50 243 253
Tetragonal crystals, optical characters 141
Tetragonal prisms see "Prism"
Tetragonal pyramids see "Pyramid"
Tetragonal scalenohedron 233
Tetragonal sphenoid 231 270
Tetragonal system 224 139
Tetragonal system, formulae 235
Tetragonal system, twins 482
Tetragonal trapezohedron 264
Tetrahedral class (cubic) 311 275
Tetrahedral-pentagonal-dodecahedral class (cubic) 275
Tetrahedral-pentagonal-dodecahedron 324 343
tetrahedron 313 334 15
Tetrakis-hexahedron 288 335
Theodolite-goniometer 601
| Thermo-electricity 332
Topaz 221 208
Tourmaline 420 146
Transformation of axes of reference 104 560
Trapezohedral class (hexagonal) 457 427
Trapezohedral class (rhombohedral) 408 344
Trapezohedral class (tetragonal) 263 225
Trapezohedral-hemihedral class (hexagonal) 427
Trapezohedron, cubic 296
Trapezohedron, hexagonal 458
Trapezohedron, rhombohedral 411 578
Trapezohedron, tetragonal 264
Traube, H. 446 460
Triad axes 19 126 132 345
Triad axes in cubic system 277 311
Triad axes, conditions for 114 117
Triakis-octahedron 292
Triakis-tetrahedron 319 334
Triclinic system 138
Trigonal bipyramid 410 422 425
Trigonal bipyramidal class (rhombohedral) 422 345
Trigonal coign 292
Trigonal prism 345 351 353 409
Trigonal pyramid 345 350 419
Trigonal-pyramidal class (rhombohedral) 344
Trigonal-trapezohedral class (rhombohedral) 344
Trimetric system 138
Triplet 464
Truncated edges 52
Tschermak, G. 525
Twin-axis 462
Twin-axis, a line in a face perpendicular to one of its edges 554
Twin-axis, determining position of 556
Twin-crystals 461
Twin-crystals, drawing 468 486 499 512 517
Twin-face 462
Twin-lamellae 464 500 515 545
Twin-law 464
Twin-law, determining 467 483
Twinned individuals, relations between indices 485
Twinning, pseudo-symmetry produced by see "Mimetic twins"
Twinning, tests of 464
Twinning, theory of 511 538 542 553
Twins of anorthic system 543
Twins of cubic system 466
Twins of hexagonal system 527
Twins of oblique system 528
Twins of prismatic system 497
Twins of rhombohedral system 513
Twins of tetragonal system 482
Unequable development 6 8 16 22
Uniaxal crystals 141
Uniterminal axis see "Symmetry-axes"
Vesuvianite 252 248
vom Rath, G. 477 547 548
von Fedorow, E. 601
von Lang, V. 58 119
Wave-surface of light 141
Weiss's zone-law 39 559
Weiss, C.S. 40 139 585
Wellsite 539
Whewell, W. 26
Witherite 501
Wollaston, W.H. 590
Wulfenite 259
Wulff, L. 327
Zircon 250 491
Zonal point 70
Zone-axis 1 33
Zone-axis, direction-ratios of 559
Zone-axis, equation of 558
Zone-axis, equation of plane perpendicular to 571
Zone-circle 77
Zone-indices 33 37
Zone-law, Weiss's 39
Zone-symbol 38
Zones 1 33
Zones, diametral 79
Zones, face common to two 43 559
Zones, hexagonal 345
Zones, relations of 33
Zwilling 461
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