Identifier: colliersnewencyc03newy (find matches)
Title: Collier's new encyclopedia : a loose-leaf and self-revising reference work ... with 515 illustrations and ninety-six maps
Year: 1921 (1920s)
Authors:
Subjects: Encyclopedias and dictionaries
Publisher: New York : P. F. Collier
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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or obliquesystem, in which two axes are at rightar.j-les and the third is inclined to theirplane; sixth, the diclinic or doublyoblique system, in which two axes are atright angles, the third oblique to both;seventh, the triclinic system, in whichthe three axes are inclined to each otherat any an^ie other than a right angle. The power of forming crystals is pos-sessed by a great majority of inorganiccombinations whether natural or artifi-cial, and also by a large number oforganic chemical bodies. The decree ofthis capacity varies greatly in differentsubstances, so that certain chemical com-binations are found only in crystals,others rarely. Bodies which entirelylack the power of forming crystals orcrystalline aggregates are called amor-phic. The size of crystals also variesgreatly. Some are very large, others areonly aggregations of microscopic crys-tals. The infinitesimally small crystalsare called microliths. Crystals grow bythe deposit of new horizontal layers CRYSTALS 212 CBYSTALS
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CRYSTALSNo. 1, Octahedron; No. 2, Hexahedron: No. 3, Rhombic Dodekahedron ; No. 4, Tetra-Hexahedron*.No. 5, Triakisicosahedron ; No. 6, Icositetrahedron ; No. 7, Hexoctahedron ; Nos. 8 and 9, Combina-tion of Hexa and Octahedron ; No. 10, Combination of Hexahedron and Dodekahedron ; No. 11,Combination of Octahedron and Dodekahedron ; Nos. 12, 13, 14, 15 and 16, Various combinationsof regular systems; No. 17, Derivation of Tetrahedron from an Octahedron ; No. 18, TrigonalDodekahedron; No. 19, Deltahedron ; No. 20, Hexakisoctahedron or Hexoctahedron; No. 21,Pentagonal Dodekahedron ; No. 22, Dyakisdodekahedron or Diploid; No. 23, TetragonalProtopyramid ; No. 24, Tetragonal Deuteropyramid ; No. 25, Ditetragonal Pyramid ; No. 26. Tetrag-onal combinations. CRYSTALLINE ROCKS 213 CTESIPHON on their surfaces, always keeping thecharacteristic angles exactly the same.Even when the growth of crystals in dif-ferent directions takes place, with un-equal rapidity, and distorted forms arise,as is ofte

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