elvann.
/ˈɛlvən/ 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 attributive.
ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [adjective] > elvan
elvana1728
the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > elvan
elvan1791
elvanite1882
a1728 T. Lower in J. Woodward Attempt Nat. Hist. Fossils Eng. (1729) i. 201 A sort of Yelvean Stone, and Earth, mixed together, down to the Load.
a1728 T. Lower in J. Woodward Attempt Nat. Hist. Fossils Eng. (1729) i. 202 A dun Stone which the Miners call Elvean Stone.]
1791 T. Beddoes in Philos. Trans. (Royal Soc.) 81 65 Whether the basaltes proceeds southward by such interruptions till it join the Elvin or Whinstone.
1864 Lyell in Reader 17 Sept. 358 One wall consisting of elvan or porphyritic granite.
1865 J. T. F. Turner Familiar Descr. Old Delabole Slate Quarries 22 Elvan (or slate whose cleavage was destroyed by internal heat) of unknown thickness.
1879 F. Rutley Study of Rocks iv. 33 The quartz-porphyries or elvans.
2. A broad vein or dike of this rock.
ΚΠ
1849 R. I. Murchison Siluria xvii. 417 Limestone pierced by elvans, or granite dykes.
Derivatives
ˈelvanite n. Mineralogy = elvan n.
ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > elvan
elvan1791
elvanite1882
1882 A. Geikie Text-bk. Geol. ii. ii. §6. 136 Elvan or elvanite..is a Cornish term for a crystalline-granular mixture of quartz and orthoclase.
elvaˈnitic adj. containing or characterized by elvanite.
ΚΠ
1883 Standard 28 July 1/6 Granulite is an elvanitic or fine-grained granite.
This entry has not yet been fully updated (first published 1891; most recently modified version published online December 2020).
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n.a1728