sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 Mohs; Color: Yellow, pink, mauve, and purple; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Yellow, pink, mauve, and purple
Luster: Vitreous to waxy

Identified June 28, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Yellow, pink, mauve, and purple; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91.

Formation & geological history

Formed through the deposition of silica from water into cracks and cavities within volcanic or sedimentary rocks. Over geological eras, minerals like iron oxides and manganese create the distinct color patterns.

Uses & applications

Primarily used for lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a popular collectible stone for tumble-polishing.

Geological facts

Jasper is a dense, opaque variety of chalcedony. The yellow and mauve variations seen here are often called 'Mookaite' if they originate from Western Australia or 'Mustard Jasper' for the yellow varieties.

Field identification & locations

Field identification is based on opacity (unlike transparent quartz), its conchoidal fracture pattern, and its high hardness. Commonly found in Australia, Brazil, and India.