| 单词 | basal pinacoid |
| 释义 | > as lemmasbasal pinacoid basal pinacoid n. Crystallography a plane or face that intersects the principal or c axis and is parallel to both a and b axes; a crystal form or solid figure containing two such planes or faces parallel to each other. ΚΠ 1858 J. Nicol Elements Mineral. i. 20 In these prisms the principal axis is supposed to be prolonged indefinitely, or to be unbounded. Where it is very short and the lateral axes infinite, the basal pinacoid is formed, consisting merely of two parallel faces. 1885 Amer. Naturalist 19 798 Twins are not uncommon, the twinning plane being the basal pinacoid. 1959 C. S. Hurlbut Dana's Man. Min. (ed. 17) ii. 96 Unlike the basal pinacoid of the orthorhombic system, it [sc. that of the monoclinic system] is not perpendicular to the c axis. 1984 Micropaleontology 30 35/1 Wall of..aragonite (orthorhombic crystal form of calcium carbonate), the hexagonal prisms with c-axis normal to the wall surface, and basal pinacoid parallel to the surface. < as lemmas |
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