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单词 orthopyramid
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orthopyramid
orthopyramid n. Crystallography Obsolete (in the monoclinic system) a pyramid for which the ratio of the intercepts made on the ortho- and clino-axes is greater than the corresponding ratio for the primary pyramid.
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the world > matter > chemistry > crystallography (general) > crystal (general) > specific crystal forms > [noun] > miscellaneous others
pyramid1748
hemihedron1837
pyritohedron1841
adamantoid1850
pyritoid1850
orthoprism1872
orthopyramid1872
polyprism1873
macropyramid1883
shish kebab1966
1872 T. Egleston Descriptive Mineral. p. xxii (table) Orthopyramid.
1898 E. S. Dana Text-bk. Mineral. (new ed.) 101 The pyramids may be unit pyramids (hhl), orthopyramids, (hkl) when h >k, or clinopyramids, (hkl) when h <k.
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