sedimentary

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Reddish-brown (iron impurities) with white quartz; Luster: Waxy to dull (earthy); Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Reddish-brown (iron impurities) with white quartz
Luster: Waxy to dull (earthy)

Identified March 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids or volcanic ash deposits where silica precipitates in cracks and pores of organic or mineral materials. This specimen appears water-worn (tumbled), suggesting it was collected from a riverbed or shoreline.

Uses & applications

Commonly used for lapidary work (cabochons), tumbled stones, ornamental landscaping, and metaphysical healing collections.

Geological facts

Jasper is an opaque variety of chalcedony. The red pigment is typically caused by the presence of Iron(III) oxide. Many cultures throughout history have referred to it as the 'Supreme Nurturer' and used it for amulets.

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and opaque nature with smooth, rounded edges if found in water. Common throughout the American Southwest, Lake Superior region, and Brazil. It does not react to acid.