sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with impure Iron inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Pale yellow to mustard yellow; Luster: Vitreous to greasy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

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

Identified March 16, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Pale yellow to mustard yellow; Luster: Vitreous to greasy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed from silica-rich fluids permeating through sedimentary rocks or volcanic ash. The distinct yellow color comes from the inclusion of iron oxides (goethite). It can be found in deposits ranging from the Precambrian to recent geological eras.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular specimen for crystal collecting and metaphysical practices.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, yellow jasper was often used as a protective talisman for travelers.

Field identification & locations

Identify by its opaque quality, waxy feel when polished, and lack of visible crystals. It is commonly found in India, South Africa, Madagascar, and the United States. Collectors look for consistent color saturation and unique banding patterns.