mineral

Jasper

Chalcedony (Microcrystalline Quartz) - SiO2

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Red, brown, yellow, green (this specimen is predominantly red with dark inclusions). Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific gravity: 2.5-2.9.

Hardness: 6
Luster: Vitreous to dull

Identified August 25, 2026More mineral →

Explore Jasper in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Formed from silica-rich fluids in volcanic rocks or sedimentary environments. The red color is typically due to iron inclusions (hematite). Can be found in various geological ages.

Uses & applications

Commonly used as a gemstone in jewelry, for carving, ornamental objects, and as tumbled stones for collectors.

Geological facts

Jasper is an opaque variety of chalcedony. The name means 'spotted or speckled stone'. It has been used since antiquity for seals, beads, and carved amulets.

Field identification & locations

Identified by its opacity, hardness (scratches glass), and typical earthy colors. Commonly found worldwide in volcanic and sedimentary deposits. For collectors, polished stones are popular and easy to identify by their smooth finish and vibrant colors.