also: しゃがん
sandstone
A sedimentary rock composed mainly of sand-sized mineral particles or rock fragments. Common in geology and everyday contexts.
The strata in this area are mainly composed of sandstone.
Sandstone is often used as a building material.
siliceous sandstone
arkose
Standard kanji spelling; the reading さがん is the most common.
Rare alternate reading; さがん is overwhelmingly preferred.
From 砂 (sand) + 岩 (rock). The reading さがん is the standard Sino-Japanese on'yomi; しゃがん is a less common variant.