sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

AI-generated identification · may be incorrect

Hardness: 6.5 - 7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Dull to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.58 - 2.91

Hardness: 6

Identified March 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of microcrystalline silica in hydrothermal veins or from the consolidation of volcanic ash and radiolarian ooze. It can range from Precambrian to recent geological ages.

Uses & applications

Used primarily for lapidary work, jewelry (cabochons), interior decoration, and as a popular specimen for rock collectors and practitioners of crystal healing.

Geological facts

Jasper is an opaque variety of chalcedony. The yellow hue is almost entirely due to the presence of goethite (iron) impurities that integrated during the formation process. Many ancient civilizations used yellow jasper as an amulet of protection.

Field identification & locations

Identify in the field by its hardness (it can scratch glass), its opaque nature, and its typical conchoidal (shell-like) fracture. Found commonly in riverbeds and arid regions in countries like India, Russia, and the USA.