sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard-brown; Luster: Dull to waxy; Crystal Structure: Microcrystalline (trigonal); Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.6-2.9.

Hardness: 6
Color: Yellow to mustard-brown
Luster: Dull to waxy

Identified July 6, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard-brown; Luster: Dull to waxy; Crystal Structure: Microcrystalline (trigonal); Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.6-2.9.

Formation & geological history

Formed from silica-rich precipitates in volcanic or sedimentary environments, where microscopic quartz crystals aggregate with mineral impurities like iron oxides during petrification. It occurs in various geological ages from Precambrian to recent.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and carvings. Also used as a decorative stone in landscaping and popular in metaphysical or crystal healing practices.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. It is known for its durability and was historically used to make tools and weapons due to its sharp conchoidal fracture.

Field identification & locations

Identify by its waxy luster, opacity (it will not let light pass through like agate), and hardness—it will scratch steel but not be scratched by it. Found worldwide in riverbeds and coastal regions, specifically famous in regions like South Africa and the USA.