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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. A sedimentary rock formed by the consolidation and compaction of sand and held together by a natural cement, such as silica.

Century Dictionary and Cyclopedia

  1. n. A rock formed by the consolidation of Sand. The grains composing sandstone are almost exclusively quartz, this mineral resisting decomposition, and only becoming worn into finer particles as abrasion continues, while almost all other minerals entering into the composition of ordinary rocks are liable to dissolve and be carried away in solution, or be worn down into an impalpable powder, so as to be deposited as mud. Sandstones may contain also clayey or calcareous particles, or be cemented by so large a quantity of ferruginous or calcareous matter as to have their original character quite obscured. Hence varieties of sandstones are qualified by the epithets argillaceous, calcareous, ferruginous, etc.

Wiktionary

  1. n. A sedimentary rock produced by the consolidation and compaction of sand, cemented with clay etc.

GNU Webster's 1913

  1. n. A rock made of sand more or less firmly united. Common or siliceous sandstone consists mainly of quartz sand.

WordNet 3.0

  1. n. a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)

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