mineral

Yellow Jasper Pebble

Silicon Dioxide (SiO2) with Iron Oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5 to 7 on the Mohs scale. Color: Yellowish-tan to mustard brown. Luster: Waxy to dull. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, exhibits conchoidal fracture.

Hardness: 6
Color: Yellowish-tan to mustard brown
Luster: Waxy to dull

Identified July 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica in groundwater within sedimentary or volcanic environments, stained yellow by goethite or other iron oxides, and subsequently rounded by wave or river action.

Uses & applications

Used for lapidary work, tumbling, cabochons, decorative stone crafts, and mineral collecting.

Geological facts

Yellow jasper owes its warm yellow-tan color to fine inclusions of hydrous iron oxide minerals like goethite. River and beach cobbles like this one have been naturally polished by water and sand over long periods.

Field identification & locations

Look for a smooth, water-worn beach pebble texture with fine-grained opacity and a waxy surface luster. Common along ocean coastlines, riverbeds, and gravel deposits worldwide.