sedimentary
Jasper with Epidote
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate Hydrate
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
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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.
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