sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow to brownish-yellow
Luster: Vitreous to waxy

Identified May 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, typically in marine or hydrothermal environments. Its yellow color comes from the presence of goethite or limonite.

Uses & applications

Used primarily for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular specimen for crystal healing collectors.

Geological facts

Jasper is an opaque variety of chalcedony. Historically known as a 'nurturing stone,' yellow jasper was highly valued in ancient civilizations for its supposed protective qualities during travel.

Field identification & locations

Identify in the field by its smooth, waxy texture, opacity (it does not transmit light even at the edges), and extreme hardness—it will easily scratch glass. Commonly found in river beds or desert wash areas, especially in regions like Madagascar or the Western USA.

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Cone-in-cone structure (Secondary Sedimentary Structure)

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Clastic Sedimentary Rock Grain (SiO2 dominated)

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Shale or Slaty Mudstone

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Sandstone

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