sedimentary

Coffee Bean Jasper

Silicon Dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Brown, tan, and cream mottled patterns, Luster: Vitreous to dull (waxy when polished), Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None, Specific Gravity: 2.58-2.91

Hardness: 6

Identified July 1, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica in sedimentary rocks or volcanic ash, combined with iron oxides and other mineral impurities that create the dendritic or mottled patterns. Often found in South Africa and North America.

Uses & applications

Primarily used for lapidary work, jewelry (beads, cabochons), home decor, and as a pocket stone for collectors.

Geological facts

The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone. It is a variety of chalcedony that is opaque due to its high mineral content.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife) and its smooth, opaque, earthy appearance. Look for it in regions with high volcanic activity or ancient sedimentary basins.