sedimentary

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Red/brown with green inclusions/streaks; Luster: Vitreous to waxy; Crystal structure: Microcrystalline (Jasper) and Monoclinic (Epidote); Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Red/brown with green inclusions/streaks
Luster: Vitreous to waxy

Identified April 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from hydrothermal solutions or within volcanic ash beds, with epidote often forming later through hydrothermal alteration or low-grade metamorphism.

Uses & applications

Used primarily for lapidary work, jewelry (cabochons), as decorative garden stones, and collected as mineral specimens.

Geological facts

Jasper is a variety of chalcedony that owes its red color to iron inclusions. When it contains green epidote, it is often sought after by lapidaries for its high contrast and ability to take a high polish.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife) and the distinctive 'pistachio green' color of the epidote against the red/brown jasper matrix. Often found in areas of historic volcanic activity.