mineral

Yellow Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 Mohs; Color: Yellow, mustard, or tan with swirling patterns; Luster: Vitreous to greasy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific gravity: 2.6-2.9

Hardness: 6
Color: Yellow, mustard, or tan with swirling patterns
Luster: Vitreous to greasy

Identified July 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed from the deposition of silica in groundwater within sedimentary or volcanic rocks. It is an opaque variety of chalcedony that gains its signature yellow color from iron inclusions (goethite).

Uses & applications

Primarily used as a decorative gemstone, in jewelry (cabochons), and for metaphysical or ornamental carvings like the mushroom shown in the image.

Geological facts

Jasper has been used for talismans and decorations for millennia; the name 'jasper' is derived from the Greek for 'spotted stone.' Large deposits are known as 'picture jasper' if the patterns resemble landscapes.

Field identification & locations

Identify by its opacity, high hardness (cannot be scratched by a steel blade), and waxy feel. It is commonly found globally, with significant deposits in India, Russia, Egypt, and the USA.