mineral

Red Jasper (Chalcedony)

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 (Mohs), Color: Brick red to brownish red, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None/Conchoidal fracture

Hardness: 6

Identified June 1, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs), Color: Brick red to brownish red, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None/Conchoidal fracture

Formation & geological history

Formed through the precipitation of silica in volcanic or sedimentary environments, often associated with iron-rich fluids that provide the deep red pigmentation through oxidation.

Uses & applications

Used primarily in lapidary work for jewelry, cabochons, and decorative ornamental items; also historically used for seal stones and amulets.

Geological facts

The name Jasper is derived from the Greek word 'iaspis', meaning spotted stone. It is known as a microcrystalline variety of quartz and is frequently mentioned in ancient literature including the Bible.

Field identification & locations

Identify by its characteristic red color, high hardness (cannot be scratched by a steel knife), and its smooth, shell-like (conchoidal) fracture surface. Found globally in areas such as India, Brazil, and the USA.

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