mineral

Jasper or Agate

Chalcedony (SiO2)

AI-generated identification · may be incorrect

Hardness 6.5-7 on the Mohs scale, opaque to translucent, waxy to dull luster, cryptocrystalline structure. Colors vary widely, often red, yellow, brown, or green due to iron oxide impurities.

Identified August 25, 2026More mineral →

Explore Jasper or Agate 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 on the Mohs scale, opaque to translucent, waxy to dull luster, cryptocrystalline structure. Colors vary widely, often red, yellow, brown, or green due to iron oxide impurities.

Formation & geological history

Formed from silica-rich fluids in volcanic or sedimentary rocks, often filling cavities or cracks over millions of years.

Uses & applications

Used primarily in lapidary arts for cabochons, beads, and carvings due to its hardness and varied colors. Also collected by rockhounds.

Geological facts

Jasper has been used historically for ornamentation and seals dating back to ancient civilizations. The name derives from Greek meaning 'spotted stone'.

Field identification & locations

Identify by its waxy luster, conchoidal fracture, hardness (scratches glass), and opacity (if jasper) or translucency (if agate). Commonly found in riverbeds, beaches, and desert areas worldwide.