sedimentary

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate Hydrate

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Reddish-brown and grayish-green; Luster: Dull to waxy; Texture: Fine-grained, microcrystalline; Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Reddish-brown and grayish-green
Luster: Dull to waxy

Identified July 17, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Reddish-brown and grayish-green; Luster: Dull to waxy; Texture: Fine-grained, microcrystalline; Cleavage: None (conchoidal fracture).

Formation & geological history

Formed through the silicification of volcanic ash or sediments; the green epidote often forms during low-grade metamorphism or hydrothermal alteration of igneous rocks.

Uses & applications

Used primarily for lapidary work, jewelry making (cabochons), and as decorative pocket stones.

Geological facts

Jasper is an opaque variety of chalcedony. The presence of iron oxides gives it the red/brown color, while the green patches are likely epidote or chlorite minerals commonly found in greenstones.

Field identification & locations

Identify by its hardness (cannot be scratched with a steel blade) and lack of transparency. Common in river beds and glacial till throughout North America.