sedimentary

Red Jasper (possibly Mookaite)

Silicon Dioxide (SiO2) with Hematite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Brick red with gray/cream mottling, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91

Hardness: 6

Identified May 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluids in volcanic ash or sedimentary beds. The red color is usually due to iron (hematite) inclusions within the cryptocrystalline quartz structure.

Uses & applications

Primarily used for lapidary arts, jewelry (cabochons and beads), decorative ornaments, and as a popular specimen for crystal healing and collections.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. It was highly prized in the ancient world for its colors and ability to take a high polish.

Field identification & locations

Identify by its opacity, smooth waxy feel when polished, and inability to be scratched by a steel knife. It is commonly found in India, Brazil, Australia, and the western United States. Tumbled stones like this are common in gift shops.