sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Limonite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Lustre: Dull to greasy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Fracture: Conchoidal; Density: 2.58-2.91

Hardness: 6
Color: Yellow to brownish-yellow

Identified July 19, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Lustre: Dull to greasy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Fracture: Conchoidal; Density: 2.58-2.91

Formation & geological history

Jasper is a microcrystalline variety of quartz that forms through the precipitation of silica from groundwater in sedimentary environments, often associated with hydrothermal activity. Its yellow color comes from the inclusion of iron oxide minerals like goethite or limonite.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and carvings. It is also a popular collector's mineral and is used in metaphysical practices for its grounding properties.

Geological facts

Yellow Jasper has been used by ancient civilizations for amulets and seals. It is known for its opacity, which distinguishes it from yellow chalcedony or citrine.

Field identification & locations

Can be identified by its smooth, waxy surface and distinct conchoidal fracture. In the field, look for opaque, hard nodules in sedimentary rock beds or along riverbanks. Commonly found in India, South Africa, and the USA.