sedimentary

Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

AI-generated identification · may be incorrect

Hardness: 6.5-7 on the Mohs scale; Color: Yellow, brownish-yellow, often opaque; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (exhibits conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Yellow, brownish-yellow, often opaque
Luster: Vitreous to dull

Identified August 3, 2026More sedimentary →

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

Forms from silica-rich solutions in sedimentary or volcanic environments, where silica precipitates and replaces other minerals (silicification) or fills cavities over millions of years.

Uses & applications

Used for making ornamental objects, cabochons, beads, carvings, and as a semi-precious gemstone.

Geological facts

Jasper has been used since ancient times for talismans, seals, and jewelry. Yellow jasper specifically was associated by ancient cultures with protection, grounding, and physical vitality.

Field identification & locations

Can be identified by its smooth, opaque, waxy-to-dull luster and distinct yellow color. Found globally in riverbeds, alluvial deposits, and hydrothermal veins. Common locations include India, Madagascar, Brazil, and the USA.