Crystallography And Practical Crystal Measurement volume 1
Crystallography And Practical Crystal Measurement volume 1
Alfred Edwin Howard Tutton
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, and illustrated in Fig. 326, page 372, is primarily a combination of the same first order hexagonal prism m as in the case of quartz with the direct primary rhombohedron r = {100} = {lOTl} and the inverse obtuse rhombo- hedron e = {110} = {OlT2}. Before proceeding to the actual construction of the measured crystal, it will be useful to draw separately these two rhombohedra, which are not the complementary direct and inverse pair, together making up a hexagonal pyramid as in the case of quartz..., but the direct and inverse representatives of quite distinct rhombohedra, which under the older method of regarding crystal structure would be considered as the opposite hemihedral halves of two different hexagonal pyramids. Moreover, the construction of the primary rhombohedron r = {10Tl} gives us the construction of the rhombohedral Millerian trigonal axes. The construction of this primary rhombohedron is shown in Fig. 352, and that of the obtuse inverse rhombohedron e= {0112} in Fig. 353. In calcite the two rhombohedra are often formed on the same crystal, the obtuser one (Fig.
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