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applied ascertained axes of digonal axial angles axial system axinite axis of hexagonal calculation called centre of symmetry characteristic containing the poles convenient corresponding crystal complex crystalline crystallographic cubic system derived described digonal symmetry directions drawing elements enantiomorphous equal intercepts face with indices faces parallel four axes four faces full symmetry give gonal hedral form hemi hemimorphism hemisphere hexagonal symmetry higher symmetry holohedral form intersection kind of hemihedrism law of rational merohedral forms monoclinic negative observed occur octant orthorhombic parallel faces pinakoids plane containing plane of projection plane of reference planes of symmetry poles of 100 position possible face pyramid ratio of intercepts rational indices respectively rhombohedron right angles shown in Fig side specimen sphere stereographic projection substance suppressed face symmetrically related ternary tetragonal textbooks three axes tion triclinic trigonal zone plane zone symbols
An Amateur's Introduction to Crystallography (From Morphological ...