sedimentary

Jasper

Jasper (SiO2 with iron inclusions)

Hardness: 6.5-7 (Mohs); Color: Red, yellow, brown, and ochre; Luster: Dull to waxy; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; SG: 2.58-2.91

Hardness: 6
Color: Red, yellow, brown, and ochre
Luster: Dull to waxy

Identified July 2, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Red, yellow, brown, and ochre; Luster: Dull to waxy; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; SG: 2.58-2.91

Formation & geological history

Formed from silica-rich fluids and sediment deposits in volcanic or sedimentary environments, often containing iron oxide impurities that provide the red and yellow coloring over millions of years.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons), ornamental carvings, and gathering for landscape/decorative purposes.

Geological facts

Jasper is an opaque variety of chalcedony. The streaks and swirls of color in this specimen are caused by varying levels of hematite (red) and goethite (yellow/brown) iron oxides.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife), smooth conchoidal fractures, and distinct opacity. It is commonly found in stream beds or glacial wash.