arkose

noun

ar·​kose ˈär-ˌkōs 

-ˌkōz

: a sandstone characterized by feldspar fragments that is derived from granite or gneiss which has disintegrated rapidly

arkosic

(ˌ)är-ˈkō-sik 

-zik

adjective

Examples of arkose in a Sentence

Recent Examples on the Web

Its heavy concentration of feldspar grains — known as arkose — means the rock is inevitably prone to chemical decay. —Washington Post, 2 Apr. 2021

Word History

Etymology

borrowed from French, of obscure origin

Note: The word was introduced by the French geologist Alexandre Brongniart (1770-1847), probably first in the article "Macigno" in the Dictionnaire des sciences naturelles, tome 27 (Strasbourg/Paris, 1823), p. 498. Brongniart says nothing about its etymology.

First Known Use

1829, in the meaning defined above