sedimentary

Yellow Jasper

Cryptocrystalline Quartz (SiO2 with Iron Hydroxide inclusions)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Dull to vitreous; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow to golden brown
Luster: Dull to vitreous

Identified June 27, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Dull to vitreous; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Formation & geological history

Formed when silica-rich fluids permeate through volcanic ash or sedimentary beds, precipitating microcrystalline quartz. The yellow color is due to the presence of goethite or other iron oxides during formation.

Uses & applications

Primarily used in lapidary arts for cabochons, beads, and carvings. Also used as a healing stone in metaphysical practices and as decor.

Geological facts

Yellow Jasper was historically used as a 'stone of endurance' and protection for travelers. It is a variety of chalcedony that is opaque due to its high mineral inclusion content.

Field identification & locations

Identified by its waxy-to-dull luster, extreme hardness (it will scratch glass), and smooth, shell-like fracture surfaces. Often found in riverbeds or desert pavements in the Western United States.