Jasper
CHEMISTRY SiO2
CRYSTALLOGRAPHY Hexagonal, microcrystaline.
REFRACTIVE INDEX 1.544 - 1.553
HARDNESS 7
SPECIFIC GRAVITY 2.651
CLEAVAGE None
HEAT SENSITIVE No
WEARABILITY Excellent
Jasper is an opaque, impure Chalcedony, traditionally thought of as red. It also comes in pinks, yellows, greens, browns, and grayish blues. Association with other minerals give jasper nice bands and patterns. In the ancient world Jasper was a favorite gem. We can find the name jasper in accent Hebrew, Assyrian, Greek, and Latin. Jasper is usually named according to its pattern. picture jasper, ribbon jasper, orbicular jasper, abraciated and etc. Jasper is found worldwide.