sedimentary

Jasper (likely Brecciated or Multi-colored)

Jasper (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Multi-colored bands (red, yellow, brown, black), Luster: Vitreous to dull, Crystal structure: Trigonal (Microcrystalline), SpG: 2.6-2.9.

Hardness: 6

Identified April 11, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Multi-colored bands (red, yellow, brown, black), Luster: Vitreous to dull, Crystal structure: Trigonal (Microcrystalline), SpG: 2.6-2.9.

Formation & geological history

Formed through the deposition of silica from mineral springs or hydrothermal veins. This specimen shows brecciation and oxidation of iron (forming the red/yellow hematite and goethite inclusions) within a microcrystalline quartz base.

Uses & applications

Used primarily in lapidary arts, jewelry (cabochons), interior decoration, and as a popular specimen for rock hounds and collectors.

Geological facts

Jasper is an opaque variety of chalcedony. Its name comes from the Greek 'iaspis', meaning 'spotted stone.' It was a favorite gemstone in the ancient world, mentioned in many historical religious texts.

Field identification & locations

Identify by its hardness (it will scratch glass), opacity, and smooth, often waxy conchoidal fracture. Often found in gravel beds or near volcanic regions.