| 单词 | nail-head spar |
| 释义 | > as lemmasnail-head spar nail-head spar n. Mineralogy a variety of calcite in which the crystals resemble nail heads, being flat rhombohedra mounted on hexagonal prisms. ΚΠ 1851 Amer. Jrnl. Sci. 62 396 Calcspar..variety called Nail-head Spar. 1902 H. A. Miers Mineral. i. 84 In the so-called ‘nail-head spar’ of Cumberland..scalenohedra of calcite..are terminated by rhombohedra whose cleavages are parallel to those of the scalenohedron. 1954 J. F. Kirkaldy Gen. Princ. Geol. xi. 155 (table) Name... Calcite... Common Form... Nail-head spar, flat rhombohedra on hexagonal prism. Dog-tooth spar, scalenohedra on hexagonal prism. < as lemmas |
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