Jasper is an opaque and finely crystalline variety of quartz. The chemical composition is identical to that of agate, flint and chert. The colors are variable, from yellow to red and brown to green. Jasper stones are cut and polished to be put in jewelry. The name jasper is from Latin and Greek (IASPIS) derived from a Semitic language and means "spotted or speckled stone". The main deposits of jasper are India (Dekkanplateau) and Mexico (yellow), Germany (red) and Africa, Australia, Brazil, Egypt, France and the US (other colors). Jasper has been used since ancient times treated as a gemstone. It was, for instance seal stones, small carved stones and fancy articles of. They wrote jasper magical powers. In ancient times it was called the mother of all stones. It is used today in cabochons, table grindings and crafts objects. Imitations are made of glass. The Egyptians and Greeks used jasper already to strengthen sexuality and to achieve a successful pregnancy. When the Indians worked the yellow jasper stone and rain. Some medicinal effects is attributed to jasper, such as stress reduction, weight loss, fighting stomach problems and remedy of liver problems. Jasper hears according to various literary sources in the constellations Aries, Virgo, Cancer and Scorpio. In Christian writing Revelation 4: 2-3 it is written: At the same time I was in ecstasy. A throne was set in heaven, and sitteth on anyone. The one who sat there had the appearance of jasper and carnelian, and around the throne was a rainbow that looked like an emerald.