sedimentary

Yellow Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard yellow; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Yellow to mustard yellow
Luster: Vitreous to greasy

Identified March 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluids in cracks or cavities in other rocks. Its yellow color comes from high concentrations of iron oxide (limonite) or clay within the silica mineral. It can be found in sedimentary environments or as primary veins in igneous host rocks.

Uses & applications

Commonly used as a gemstone in jewelry, for decorative carvings, and as a popular specimen for rock tumbling and metaphysical collections.

Geological facts

Yellow jasper has historically been known as a 'nurturing stone' and was used by various ancient cultures in amulets. Its opaque nature distinguishes it from yellow chalcedonies like citrine or yellow agate.

Field identification & locations

Identify in the field by its opaque yellow color, smooth conchoidal fracture (if broken), and high hardness (it will scratch glass). Often found in riverbeds or coastal areas as water-worn pebbles. Common locations include India, Russia, Brazil, and the Southwestern United States.