sedimentary

Brecciated Jasper / Fossiliferous Jasper Egg

Cryptocrystalline Quartz (SiO2) with iron oxides and mineral inclusions

AI-generated identification · may be incorrect

Hardness: 6.5 - 7 on Mohs scale; Color: deep brownish-red to maroon with greenish-gray and yellowish-cream patterned inclusions; Luster: vitreous to waxy (high polish); Crystal system: Trigonal (microcrystalline); Cleavage: none (conchoidal fracture); Specific gravity: 2.58 - 2.64

Hardness: 6
Luster: vitreous to waxy (high polish)

Identified October 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition and precipitation of silica-rich fluids in sedimentary or low-grade volcanic environments, often incorporating fragments of earlier rock (breccia) or organic/fossil material (e.g., stromatolitic or algae/shell inclusions) and colored by hematite and iron silicates.

Uses & applications

Commonly carved and polished into decorative shapes such as eggs, spheres, and cabochons for mineral collections, interior decor, and metaphysical/lapidary use.

Geological facts

Egg-shaped polished stones have been popular collector items since Victorian times, symbolizing rebirth and fertility. Jaspers with patterned clasts or fossilized microbial structures are among the oldest geological evidence of life on Earth.

Field identification & locations

Identifiable by its high polish, mottled deep red and green-tan clastic or orbicular patterning, and superior scratch resistance compared to softer marbles. Common sources include Madagascar, South Africa, Australia, and the western United States.