mineral

Jasper with Quartz

Silicon Dioxide (SiO2) - Chalcedony variety

Hardness: 6.5–7 on Mohs scale; Color: Red, brown, and white; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Fracture: Conchoidal.

Hardness: 6
Color: Red, brown, and white
Luster: Vitreous to waxy

Identified April 1, 2026More mineral →

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Physical properties

Hardness: 6.5–7 on Mohs scale; Color: Red, brown, and white; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Fracture: Conchoidal.

Formation & geological history

Formed through the deposition of silica from groundwater in cracks and cavities within volcanic or sedimentary rocks, often enriched with iron pigments that give the red and brown coloration.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons), talismans, and as decorative pocket stones or garden accents.

Geological facts

The name 'Jasper' is derived from a Greek word meaning 'spotted stone.' It is a cryptocrystalline variety of quartz that can contain up to 20% foreign materials, which determines its unique patterns and colors.

Field identification & locations

Identify by its waxy texture, hardness (cannot be scratched by a steel knife), and the mixed opaque (jasper) and translucent (quartz) sections. Often found in riverbeds or areas with ancient volcanic history.

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