mineral

Jasper / Agate / Chalcedony

Cryptocrystalline quartz (SiO2)

AI-generated identification · may be incorrect

Hardness 6.5-7, waxy to dull luster, variable colors (red, orange, brown, dark grey/black in this specimen), massive crystal structure, conchoidal fracture.

Identified August 25, 2026More mineral →

Explore Jasper / Agate / Chalcedony in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness 6.5-7, waxy to dull luster, variable colors (red, orange, brown, dark grey/black in this specimen), massive crystal structure, conchoidal fracture.

Formation & geological history

Formed from silica-rich fluids depositing in cavities or cracks in rocks, often volcanic or sedimentary environments.

Uses & applications

Lapidary, tumbling, jewelry making, ornamental stone, collecting.

Geological facts

Jasper is an opaque variety of chalcedony, colored by various impurities like iron oxides (red/brown). When wet, it shows enhanced colors and patterns.

Field identification & locations

Identify by its hardness (scratches glass), waxy luster, lack of cleavage, and typical patterns/colors. Often found in riverbeds, beaches, and gravel deposits.