| 释义 |
elvan|ˈɛlvən|
Also 8 elvin.
[In the West Cornwall Gloss. (E.D.S.) referred to Corn. elven spark, ‘the rock being so hard as to strike fire’.]
1. The name given in Cornwall to intrusive rocks of igneous origin, so hard as to resist the pick, as quartz-porphyry, whinstone, etc. Also attrib.
1791Beddoes in Phil. Trans. LXXXI. 65 Whether the basaltes proceeds southward by such interruptions till it join the Elvin or Whinstone. 1864Lyell in Reader 17 Sept. 358 One wall consisting of elvan or porphyritic granite. 1865J. T. Turner Slate Quarries 22 Elvan (or slate whose cleavage was destroyed by internal heat) of unknown thickness. 1879Rutley Stud. Rocks iv. 33 The quartz-porphyries or elvans.
2. A broad vein or dike of this rock.
1849Murchison Siluria xvii. 417 Limestone pierced by elvans, or granite dykes.
Hence ˈelvanite. Min. = elvan. elvaˈnitic a., containing or characterized by elvanite.
1882Geikie Text-bk. Geol. ii. ii. §6. 136 Elvan or elvanite..is a Cornish term for a crystalline-granular mixture of quartz and orthoclase. 1883Standard 28 July 1/6 Granulite is an elvanitic or fine-grained granite. |