sedimentary
Jasper (likely Brecciated or Multi-colored)
Jasper (SiO2)
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
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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.
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