Mineral

Jasper

Silicon Dioxide (SiO2) with impurities (mostly Iron Oxides)

Hardness: 6.5-7 (Mohs scale); Color: Typically reddish-brown, tan, or ochre due to iron content; Luster: Dull to waxy; Crystal Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Typically reddish-brown, tan, or ochre due to iron content
Luster: Dull to waxy

Identified March 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed from the deposition of silica in fluids within cracks/cavities of volcanic or sedimentary rocks. This specimen is a water-worn beach pebble, likely weathered out of older formations and smoothed by wave action over thousands of years.

Uses & applications

Commonly used for lapidary work (cabochons), jewelry, ornamentation, and as a popular collector's item for beachcombers and rockhounds.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone.' It has been used for seals and amulets since the Minoan civilization in Crete.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate), its hardness (it will scratch glass but not be scratched by a steel knife), and its smooth, waxy feel when wet. Frequently found on beaches and riverbeds globally.

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