sandstone <p>A consolidated sedimentary rock, consisting of sand grains united with a natural cementing material; the most common sand in sandstone contains quartz, with considerable feldspar, lime, mica, and clayey matter.<br /> </p> <p>Source: AAT </p> <p><a href="http://vocab.getty.edu/page/aat/300011376" target="_blank" rel="noopener">http://vocab.getty.edu/page/aat/300011376</a></p>