| 释义 |
pisolite Min.|ˈpɪzəlaɪt, ˈpaɪsə-|
Also 8 -lithe.
[ad. mod.L. pisolith-us, f. Gr. πίσο-ς, -ον, pea + -lite. So F. pisolithe.]
a. = pea-stone.
1868Dana Min. (ed. 5) 679 Pisolite..consists of concretions as large often as a small pea. 1931S. J. Shand Study of Rocks xi. 153 Oolite and pisolite are limestones built up of little spheroidal bodies resembling the roe of fishes or heaps of peas. 1962Read & Watson Introd. Geol. I. v. 266 Other chemical limestones are not of much account; they include deposits from calcareous springs, such as pisolite, tufa and travertine.
attrib.1816W. Smith Strata Ident. 19 The Pisolite Freestone beneath [the Coral Rag] is softer. 1884Lyell Elem. Geol. (ed. 4) 12 Pisolite limestone has the oolitic grains of considerable size.
b. Applied to an individual grain of this similar to an oolith but larger (in mod. use applied to grains of diameter 2 mm. or more).
1708Phil. Trans. XXVI. 79 Pisolithus, the Pisolite, or Gland. 1788[see oolith]. 1851Richardson Geol. vi. (1855) 158 Occasionally each pisolite encloses in its centre a grain of foreign substance. 1893Q. Jrnl. Geol. Soc. XLIX. 127 The series for some distance above the typical Pea-grit..contains here and there aggregations of brown pisolites. 1925Nat. Geogr. Mag. XLVIII. 313 These spherical bodies are known to geologists as pisolites and to jewelers as cave pearls. 1956E. W. Heinrich Microsc. Petrogr. v. 153 The limonite may be in spongy masses..or in pisolites and concretionary masses. 1974Encycl. Brit. Macropædia XVI. 466/2 Pisolites are similar to oolites and range from two to about ten millimetres (0·4 inch) in diameter. |