an opaque form of quartz; red or yellow or brown or dark green in color; used for ornamentation or as a gemstone
source: WordNet 3.0
An opaque, impure variety of quartz, of red, yellow, and other dull colors, breaking with a smooth surface. It admits of a high polish, and is used for vases, seals, snuff boxes, etc. When the colors are in stripes or bands, it is called striped or banded jasper. The Egyptian pebble is a brownish yellow jasper.