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according aggregates alternate angles arrangement axial axis basal pinacoid becomes belonging bounded called classes combination common complete construction corresponding Course crystal forms crystal planes crystallographic cube derived determined developed direction dodecahedron edges entirely equal examples faces figures four fundamental give given growth half hemihedral hemimorphic hence hexagonal holohedral holohedrons illustrated importance indices individuals intersect isometric system kind known lateral axes length limiting forms lines method molecular molecules monoclinic nature negative normal observed obtained occur octants orthorhombic pairs parallel parameter periods physical planes of symmetry position possess possible present prism produced Professor projection pyramid ratio reference reflection regard regular relation represents result rhombohedron second order secondary selection shows signs similar single solid structure substance symbols tetartohedral tetragonal tetrahedral third tion triclinic trisoctahedron twinning twinning plane types unit unity University values vertical vertical axis zone
Página 24 - ... it is one of the oldest as well as one of the most important of the lumber associations in existence. The Yellow Pine Association first had its origin among cer'Preliminary Report of the Federal Trade Commission on Activities of Lumber Manufacturers
Página 23 - ... principle in crystallography since that time and should not be abandoned unless the evidence is clearly against it. FIG. 2. The production of an (11o) face. Some authors express the fundamental law of crystallography as the law of simple mathematical ratio. Thus Williams4 says : " Experience has shown that only those planes occur on any crystal whose axial intercepts are either infinite or small even multiples of unity.
Página 42 - This system embraces all forms referable to three axes of unequal length, two of which intersect at an oblique angle, while they are both at right angles to the third.