sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with goethite/iron oxide inclusions

Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9

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

Identified May 31, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water into cracks or cavities in sedimentary or volcanic rock. Its yellow color is derived from iron compounds like goethite or limonite. Most specimens date back to the Cretaceous or older periods.

Uses & applications

Commonly used in lapidary work for making cabochons, beads, and polished stones. It is popular in jewelry and as a decorative stone for home accents.

Geological facts

Jasper has been used by ancient civilizations for amulets and tools for thousands of years. It was mentioned in the Bible as being one of the stones in the High Priest's breastplate. Its name comes from the Greek word 'iaspis', meaning 'spotted stone'.

Field identification & locations

Identify in the field by its opaque nature (even on thin edges), its hardness (can scratch glass), and its distinctive conchoidal fracture. Commonly found in South Africa, Brazil, India, and the USA (California and Oregon).

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