sedimentary

Jasper (Nephrite-like appearance)

Silicon Dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Deep dark green to black-green. Luster: Vitreous to waxy when polished. Crystal structure: Cryptocrystalline. Cleavage: None. Specific Gravity: 2.6-2.9.

Hardness: 6
Color: Deep dark green to black-green
Luster: Vitreous to waxy when polished

Identified June 6, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on Mohs scale. Color: Deep dark green to black-green. Luster: Vitreous to waxy when polished. Crystal structure: Cryptocrystalline. Cleavage: None. Specific Gravity: 2.6-2.9.

Formation & geological history

Formed from the deposition of silica from water solutions into cavities of other rocks or as replacement material. Often smoothed by fluvial or marine erosion.

Uses & applications

Used primarily for lapidary work, jewelry, pocket stones, and decorative carvings. It is also a popular stone for tumbling.

Geological facts

Dark green jasper was historically known as 'heliotrope' or 'bloodstone' if it had red spots. This specific uniform dark green variety is often sold as 'Evergreen Jasper'.

Field identification & locations

Identify in the field by its opacity (jasper is opaque), smooth water-worn texture, and hardness (cannot be scratched by a steel knife). Commonly found in riverbeds and along beaches.