Physical Attributes of Jasper Jasper is one of the main minerals in the chalcedony group. It is a kind of silica with varying impurities of other minerals, which are responsible for the wide variety of colors in jasper. The hardness of jasper is slightly less than pure quartz, at 6.5-7 on the Mohs scale, but still durable enough to be widely used in jewelry and as a carving stone, of which its brilliant colors have long been admired throughout history. The typical colors of jasper range from red, brown, yellow, green, blue, milk white, and basically every shade in between.
Read More