sedimentary

Red Jasper (Tumbled)

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7.0 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish-red
Luster: Vitreous to waxy

Identified March 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica from water solutions into fissures or cavities in volcanic or sedimentary rocks. The red color is derived from high iron content (hematite inclusions). It occurs in rocks ranging from the Archean era to recent deposits.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons and beads), decorative ornaments, and widely sold as a 'healing stone' in metaphysical shops.

Geological facts

Jasper has been used as a gemstone since antiquity; it was a favorite in the ancient world and is mentioned in the Bible and ancient Greek texts. The name comes from the Greek word 'iaspis', meaning 'spotted stone'.

Field identification & locations

Identify by its opaque nature (unlike carnelian which is translucent), its smooth conchoidal fracture, and it cannot be scratched by a steel knife. Frequently found in riverbeds and desert environments in regions like South Africa, Brazil, India, and the USA.

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