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                In 1905, a certain Professor Paul Groth of Müchen, Germany, published his textbook "Physikalische Krystallographie" in Leipzig with the publishing firm of Wilhelm Engelmann.  In this textbook are 750 illustrations, many of which are crystal forms of "wichtigsten substanzen" (the most important substances).  A small but representative portion of Herr Professor Doktor Groth's 820 page tome is found at the link above.
 Also in 1905, the Dr. F. Krantz Company of Bonn, Germany, produced a particular set of 416 crystal models in pearwood as described in their Krantz  Katalog Nr 6b.  The crystal model numbers listed on the right side of this page are the Krantz catalog numbers for those models which are extant in the EOS collection.  Catalog Number 6b may be found at the link above.
 
                  
                    The 416 wooden crystal models in Krantz Catalog 6b were manufactured in collaboration with Professor Groth.  These models correspond to the illustrations in Professor Groth's textbook.  The figure numbers to the right on this page are from "Physikalische Krystallographie".
                   
              
                
                  
                    Crystal Model Number 7 Drawn with KrystalShaper© JCrystalSoft, 2013
 
              
                
                  
                    Symmetry Class, Unit Cell, and Miller Indicies for Model 7 in KrystalShaper© JCrystalSoft, 2013
 
              
                
                  
                    
                      
                        Model Numbers
                      
                      Krantz Catalog 6b
 
 
                  
                    
                      Unknown half3
 7 cracked
 8
 10
 12
 13
 15
 16
 17
 18
 21
 23 (? or 25)
 26 cracked
 29 (2 piece)
 30
 33
 35
 38 (2 piece)
 39
 43
 44
 46
 53
 56
 57
 58 ?
 65
 67
 69
 70
 71
 75
 76
 77 ? [7 on top of 9]
 79? [separate model]
 79
 80
 81
 83
 84 (or 87, uncertain)
 85 (?)
 87 (or 80 [7 on top of 0]) damaged
 90
 91
 92
 93
 94
 96
 96
 100 damaged
 101 (102 [1 on top of 2])
 102
 105
 106 (107 [7 on top of 6])
 107
 109 (or 110?)
 111
 112
 115
 117
 119
 121
 122
 123
 124
 125 (127 [7 on top of 5])
 127
 128
 129
 130
 133
 135
 136
 137
 138
 139
 140 (141 [1 on top of 0]
 141
 143
 144
 145
 146
 149
 150
 151
 153
 154
 155
 156
 157 ?
 157
 158
 159
 160
 161
 163
 164 damaged
 166
 171
 172
 174
 175
 176
 177
 178
 180 (unknown underneath)
 180
 181
 182
 183
 193
 194
 195
 196
 197
 198 (unknown underneath)
 200 (unknown underneath)
 201
 202
 205 (or 203 [uncertain])
 209
 210 (201 [1 on top of 7])
 211
 212
 213
 214
 215
 217
 219
 220 ?
 220 (227 [0 on top of 7])
 222 (slight damage)
 223
 225
 228 (221 [8 on top of 1])
 229 (unknown underneath)
 230
 232 (unknown underneath)
 237
 237
 239
 240
 240
 241
 242
 243
 244
 245 ? (245,246,248 all uncertain numbers)
 246 ?
 247
 248 ? (out of order; goes with 245, 246)
 250
 251 (2 piece)
 253
 256
 257
 258 (257 [ 8 on top of 7])
 259
 260
 261
 262
 263 (unknown underneath)
 265
 267
 268
 284 or 234 damaged
 286 (unknown underneath)
 293
 294
 295
 297 (unknown underneath)
 298
 299
 302
 303 (unknown underneath)
 305
 306
 307 (unknown underneath)
 310
 311 (unknown underneath)
 312 (unknown underneath)
 318 (unknown underneath)
 321
 324
 327 (unknown underneath)
 332
 333
 338
 338 ?
 339
 343 (320 underneath)
 349 (unknown underneath)
 350
 353 damage
 354
 355
 356
 357 ?
 361
 363
 364
 371
 377
 380
 389 damage
 390
 392
 394
 397
 400
 401
 402
 403
 406
 407
 408
 412
 414
 
                  
                    
                  
                   
              
                
                  
                    
                      Figure Numbers
                    
                    Physikalische Krystallographie
 
                    
                      
                        - 189
 194
 195
 196
 198
 199
 204a
 204b
 205
 206
 (no number listed)
 212
 217
 220
 223
 226
 228
 231
 (no number listed)
 (no number listed)
 234
 237
 245
 248
 249
 250
 258
 262b
 264
 265
 266
 271
 273
 274
 276
 -
 277
 278
 280
 281
 (no number listed)
 283
 (no number listed)
 285
 286
 287
 288
 290
 -
 (no number listed)
 294
 295
 298
 299
 300
 302
 303
 305
 308
 310
 313
 315
 316
 317
 318
 319
 321
 322
 323
 324
 (no number listed)
 336
 337
 338
 339
 340
 341
 342
 345
 346
 347
 348
 351
 352
 353
 355
 356
 357
 358
 359
 -
 361
 363
 365
 366
 368
 369
 371
 (no number listed, “Modell 152 . . . Modell 140”)
 (no number listed)
 (no number listed, “Modelle 132, 141, und 142”)
 374
 375
 376
 377
 379
 -
 380
 381
 382
 388
 405
 406
 407
 408
 409
 412b
 413
 414
 418
 422
 423a und b
 (no number listed)
 424
 425
 426
 427
 429
 (no number listed)
 431
 -
 433
 435
 437
 440
 441
 (no number listed)
 442
 446
 -
 450
 451
 -
 452
 453
 454
 455
 457
 458
 459
 461
 140
 463
 466
 469
 470
 471
 472
 473
 (no number listed)
 475
 (no number listed)
 484
 488
 489
 504
 507
 517
 523a
 523b
 525
 523
 527
 530
 531
 533
 534
 535
 538
 539
 540
 546a
 548
 553
 556
 (no number listed)
 (no number listed)
 (no number listed)
 -
 562
 567
 (no number listed)
 (no number listed)
 (no number listed)
 (no number listed)
 (no number listed)
 571
 (no number listed)
 578
 580
 581
 (no number listed)
 (no number listed)
 (no number listed)
 589
 591
 593
 595
 598
 601
 602
 603
 604
 607
 608
 609
 (no number listed)
 (no number listed)
 
                    
                      
                    
                     
                  
                    
                      
                        Figure 194 and related text from Professor P. Groth's 1905 version of "Physikalische Krystallographie"
                      
                       
                  
                    
                      
                        Model 7 entry in the Dr. F. Krantz Company Catalog 6b.  Note that model 7 corresponds to figure 194.
                      
                       
                  
                    
                      
                        Unless specified on the Model Page, the distance values in KrystalShaper are given in centimeters and indicate the actual size of the wooden model.
                       
                        Distances are measured, of course, from the orgin of the coordinate system.
                       
                        In Model 10 for example, the distance between parallel planes {010} and {0 -1 0} is 2.41 centimeters.
                      
                       
                  
                    
                      
                        
                          
                            webpages and Eos image copyright 2013 M Nealon
                          
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