sedimentary
Jasper with Epidote
Silicon Dioxide (SiO2) with Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
Hardness: 6.5-7 on the Mohs scale. Color: Reddish-brown, brick red, with yellowish-green patches. Luster: Vitreous to dull. Crystal structure: Microcrystalline (trigonal quartz variety). Cleavage: None (fractures conchoidally). Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Reddish-brown, brick red, with yellowish-green patches
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on the Mohs scale. Color: Reddish-brown, brick red, with yellowish-green patches. Luster: Vitreous to dull. Crystal structure: Microcrystalline (trigonal quartz variety). Cleavage: None (fractures conchoidally). Specific gravity: 2.58-2.91.
Formation & geological history
Formed through the silification of sedimentary rocks or volcanic ash, where silica-rich fluids permeate the material, often accompanied by hydrothermal alteration introducing epidote in fractures and voids. Geological age varies widely depending on the formation location, spanning Precambrian to Cenozoic eras.
Uses & applications
Used primarily in lapidary arts, making cabochons, tumbled stones, decorative ornaments, and collector specimens.
Geological facts
Jasper is an ancient gemstone mentioned in various historical and religious texts, often prized for its rich earthy colors and durability. The combination of red jasper and green epidote creates a striking contrast that is popular among rockhounds.
Field identification & locations
Can be identified in the field by its distinct red and green mottled coloration, conchoidal fracture, and high hardness which scratches glass. Commonly found in riverbeds, glacial drift, and mountainous regions associated with hydrothermal activity worldwide.
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