[sand-stohn] 
| a common sedimentary rock consisting of sand, usually quartz, cemented together by various substances, as silica, calcium carbonate, iron oxide, or clay. |
| sand·stone (sānd'stōn') n. A sedimentary rock formed by the consolidation and compaction of sand and held together by a natural cement, such as silica. |
A sedimentary rock formed of sand-sized grains that have been either compacted or cemented together. Altough sandstone usually consists primarily of quartz, it can also consist of other minerals.
