This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...orders the corresponding prisms. 7. Hexagonal basal pinacoid. The faces of this form are parallel to the principal plane of symmetry and possess the following symbols cca: cca: cca: c), OP, oooi. It is evident from the presence of a center and principal plane of symmetry that two such planes are ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...orders the corresponding prisms. 7. Hexagonal basal pinacoid. The faces of this form are parallel to the principal plane of symmetry and possess the following symbols cca: cca: cca: c), OP, oooi. It is evident from the presence of a center and principal plane of symmetry that two such planes are possible. This, like the prisms, is an open form and must always occur in combination. Figure 141 shows this form in combination with the prism of the first order. These are the seven simple forms possible in this system. Their principal features may be summarized as follows: Relation of forms. The following diagram, similar to the one for the cubic system, page 23, expresses very clearly the relationship existing between the various simple forms. a: Oca: a: ccc na: pa: a: occ 2a: 2a: a: Occ Combinations. The following figures illustrate some of the combinations of forms of this class. Figure 144, p = P, 1011; o = mP, hohl. Figure 145, f = P, ioir; n = P2 i ii2i. Fig 147. Fig. 148. (Holohedrism with Hemimorphism.) Symmetry. The forms of this class are hemimorphic, that is, the principal plane of symmetry disappears and the singular, c, axis is now polar, page. 16. The disappearance of the principal plane necessitates also the loss of the center and six binary axes of symmetry. Hence, the remaining elements are three secondary and three intermediate planes, and one polar axis of hexagonal symmetry parallel to the c axis. Figure 149 shows the elements of symmetry of this class.2' Forms. The forms of this class differ from those of the preceding (holohedral) in that the faces occurring about either pole3' are to be considered as belonging to independent forms. Hence, each of the three bipyramids yields two new forms, called upper and lower pyramids, ...
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