metamorphic

Polished yellow jasper cabochon

Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay inclusions

AI-generated identification · may be incorrect

Opaque mustard-yellow to brown, glassy-to-waxy luster, commonly patterned; hardness about 6.5–7 Mohs, no visible cleavage, cryptocrystalline quartz structure, specific gravity about 2.6. The silver-toned setting is jewelry metal, while the cabochon is geological material.

Identified September 1, 2026More metamorphic →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids cement or replace sediments and volcanic material, with iron compounds producing yellow, orange, and brown colors. Its exact age cannot be determined visually; deposits occur in many geological ages.

Uses & applications

Used for cabochons, rings, beads, carvings, and ornamental objects; durable but less valuable than transparent gemstones.

Geological facts

Yellow color commonly reflects hydrated iron oxides or earthy mineral inclusions. Patterned jasper varieties may receive trade names based on locality or appearance.

Field identification & locations

Identify by opacity, fine-grained texture, waxy polish, and resistance to scratching by steel; it should not show glass-like transparency or cleavage. Common sources include Australia, Brazil, India, Madagascar, Mexico, and the western United States.