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arkose
[ ahr-kohs ]
noun
- a granular sedimentary rock composed of quartz and feldspar or mica; a feldspathic sandstone.
arkose
/ ˈɑːkəʊs /
noun
- a sandstone consisting of grains of feldspar and quartz cemented by a mixture of quartz and clay minerals
arkose
/ är′kōs /
- A usually pinkish or red sandstone consisting primarily of quartz and feldspar. Arkose usually forms as the result of the rapid disintegration of granite in areas of vigorous erosion. Its grains are usually angular and poorly sorted (mixed randomly in differing sizes).
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Other Words From
- ar·kosic adjective
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Word History and Origins
Origin of arkose1
Borrowed into English from French around 1830–40
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Word History and Origins
Origin of arkose1
C19: from French
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Example Sentences
Its heavy concentration of feldspar grains — known as arkose — means the rock is inevitably prone to chemical decay.
From Washington Post
The lowest cretaceous rocks yet found are composed of an arkose, derived in large part from the original igneous mass.
From Project Gutenberg
At the base there is often an arkose, composed largely of fragments of serpentine and granite derived from the ancient floor.
From Project Gutenberg
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