Jasper

Category

Quartz

Crystal Form

Trigonal (Microcrystalline)

Moh's Scale Hardness

6.5–7.0

Specific Gravity

2.58-2.91

Refractive Index

1.54

Sources

Egypt, Australia, Brazil, India, Canada, Kazakhstan, Madagascar, Russia, Uruguay and United States.

Jasper is an opaque stone that belongs to the chalcedony species. The name jasper is derived from the Greek word that means "spotted stone". Jasper is usually multi-coloured,stripped or flamed. A uniform-coloured jasper is very rare.

Inclusions

Jasper may contains up to 20% of foreign materials that determine its physical appearance. Sometimes jasper may contains agate, opal or fossilized material.