Granitic
Relating to or resembling granite in composition, texture or appearance; the intended sense must be established from context because not all granitic rocks are granite sensu stricto.
Language and route: English adjective from granite. English granitic is adjectival granite; granite reached English from Italian granito, ‘grained’, with Latin grānum, ‘grain’, at a deeper stage.
Literal gloss: granite-like; grained
The name and its history
Ordinary derivative of granite; inventor not established · Historical geological usage in nineteenth century
- What does the word literally mean?
- ‘Granite-like’ or ‘of granite’, through Italian granito.
- What did the original author mean?
- Early writers described granitic veins, intrusions and crystalline textures comparatively, before modern modal schemes drew stricter boundaries between granite and neighbouring granitoid rocks.
- Why was the name needed?
- The adjective allowed a comparison between rocks sharing appearances or intrusive relations without assigning a precise species name.
- What evidence supported the original concept?
- Hand-specimen comparisons of quartz–feldspar crystals, textures and intrusions; nineteenth-century usage in Lyell includes “granitic dikes”.
- How has geology changed the concept?
- Today a “granitic” composition can be broader or context-dependent, whereas IUGS granite is a more specifically defined rock classification. The words must not be treated as exact synonyms.
Further historical context
Lyell’s nineteenth-century discussion of granite veins uses the comparative adjective in arguments about relative rock ages.
The adjective is an editorially justified separate entry because automatically redirecting to granite would erase a common distinction.
Editorial qualification
Definition depends on whether author means granite-like texture, broadly felsic composition, or classified granite.
Related names
Granite · Igneous · Magma · Plagioclase
Sources
- Charles Lyell (1833), Principles of Geology, vol. 3, chs. XXV–XXVI, full transcript — Contemporaneous evidence for the meaning of metamorphic and the challenge to primitive-rock classification
- Le Maitre et al. (2002), Igneous Rocks: A Classification and Glossary of Terms (IUGS) — International igneous nomenclature and modal proportion conventions
- Online Etymology Dictionary, granite — Italian granito and Latin granum linguistic connection