mineral

Yellow Jasper

SiO2 (Microcrystalline Quartz)

Hardness: 6.5-7 on Mohs scale; Color: Yellow, mustard, ochre-brown with darker veins or mottling; Luster: Waxy to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Yellow, mustard, ochre-brown with darker veins or mottling
Luster: Waxy to vitreous

Identified July 27, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids deposit microcrystalline quartz along with iron oxides and hydroxides (such as goethite or limonite) that impart the yellow-brown color. Typically found in sedimentary beds, alluvial gravels, or volcanic rock cavities.

Uses & applications

Used extensively as a lapidary material for cabochons, beads, carvings, tumbled stones, and decorative landscaping pebbles.

Geological facts

Yellow Jasper gets its distinct earthy mustard tone primarily from inclusions of iron hydrate minerals. In antiquity, jasper was widely used for seal stones, amulets, and ornamental items.

Field identification & locations

Can be identified by its smooth, stream-rounded surface, waxy luster when wet or polished, and inability to be scratched by steel. Commonly found in riverbeds, lake shores, and gravel deposits worldwide.