sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Hardness: 6.5-7 on the Mohs scale; Color: Mustard yellow to golden brown; Luster: Dull to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91

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

Identified March 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water-rich environments, often being consolidated from volcanic ash or sediment over millions of years through a process called silicification.

Uses & applications

Commonly used for lapidary work, decorative cabochons for jewelry, worry stones, and as an ornamental landscaping stone. It is also a popular stone for chakra-based spiritual practices.

Geological facts

Jasper is an opaque variety of chalcedony. The yellow coloring specifically comes from the presence of iron inclusions (specifically goethite). It has been used historically by ancient civilizations for amulets and seals.

Field identification & locations

Identify in the field by its opacity (unlike translucent citrine), its hardness (will scratch glass), and its smooth, water-worn texture often found in riverbeds or beaches. Common in many parts of the US, especially the Pacific Northwest.

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