mineral

Yellow Jasper

Silicon Dioxide (SiO2) with iron impurities

Hardness: 6.5 - 7 on the Mohs scale. Color: Mustard yellow to golden brown. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (trigonal) microcrystalline. Cleavage: None (conchoidal fracture). Specific Gravity: 2.58 - 2.91.

Hardness: 6
Color: Mustard yellow to golden brown
Luster: Vitreous to waxy

Identified March 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from hydrothermal solutions or in sedimentary environments. Its yellow color is derived from high iron oxide (goethite) content. It can be found in volcanic rocks as well as sedimentary formations.

Uses & applications

Used primarily in lapidary work for jewelry (cabochons, beads), decorative carvings, and as a popular stone for collectors of tumbled river stones or metaphysical minerals.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, yellow jasper was believed to offer spiritual protection for travelers.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate) and smooth, waxy surface when tumbled. Frequently found in riverbeds or coastal deposits. Collectors should look for unique banding or 'picture' patterns within the stone.

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