sedimentary

Yellow Jasper

Silicon dioxide (SiO2)

Hardness: 6.5 - 7 (Mohs); Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Crystal structure: Hexagonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58 - 2.91.

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

Identified April 13, 2026More sedimentary →

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Physical properties

Hardness: 6.5 - 7 (Mohs); Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Crystal structure: Hexagonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58 - 2.91.

Formation & geological history

Formed from silica-rich groundwater percolating through sedimentary rocks or volcanic ash, where the silica precipitates in microscopic crystals. The yellow color comes from high iron inclusions (goethite or limonite).

Uses & applications

Used primarily in lapidary work for cabochons, beads, and orbs. It is also a popular specimen for crystal healing and geological collections.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was known as the 'supreme nurturer' and was used in ancient times as a protective talisman against evil spirits.

Field identification & locations

Identify by its opacity (it will not let light through even at edges), waxy feel when polished, and its ability to scratch glass. Commonly found in riverbeds and desert environments globally.