sedimentary

Yellow Jasper with Red Inclusion

Silicon Dioxide (SiO2) with Iron Oxides

Hardness: 6.5-7 on Mohs scale; Color: mustard yellow with brownish-red spots/mottling; Luster: waxy to vitreous when polished; Crystal Structure: microcrystalline trigonal; Cleavage: none; Fracture: conchoidal; Specific Gravity: 2.58-2.91.

Hardness: 6
Color: mustard yellow with brownish-red spots/mottling
Luster: waxy to vitreous when polished

Identified July 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when silica-rich waters precipitate microcrystalline quartz along with iron oxides and clay impurities in sedimentary or volcanic environments over millions of years, leading to a opaque, colorful chalcedony rock.

Uses & applications

Used primarily as lapidary material, tumbled stones, pocket stones, beads, carved cabochons, and decorative items.

Geological facts

Yellow jasper owes its bright mustard color to goethite or iron oxide inclusion, while red mottling is usually due to hematite. Native American cultures and ancient Egyptians used jasper for amulets, seals, and tools.

Field identification & locations

Identify by its hardness (scratches glass), waxy luster, opacity, smooth tumbled surface, and characteristic mottling of yellow and reddish-brown. Common in riverbeds, desert pavements, and gravel deposits worldwide.

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