sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-gold, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91

Hardness: 6

Identified May 31, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-gold, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91

Formation & geological history

Formed from silica-rich fluids depositing in cracks and voids of volcanic or sedimentary rocks, often enriched with iron minerals that provide the yellow pigment.

Uses & applications

Used primarily in lapidary arts for cabochons, beads, jewelry, and as a decorative architectural stone or tumble stone.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it has been used for millennia for seals and ornamentation; it is mentioned in several ancient cultural and religious texts.

Field identification & locations

Identify by its waxy luster, opacity (unlike citrine which is translucent), and its inability to be scratched by a steel knife. Frequently found in riverbeds and coastal regions globally.