sedimentary
Red Jasper (with inclusions)
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red with white/gray quartz swirls, Luster: Vitreous when polished, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red with white/gray quartz swirls, Luster: Vitreous when polished, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water-rich sources in sedimentary or volcanic environments, typically acquiring its red color from high iron content (hematite inclusions).
Uses & applications
Commonly used for lapidary work, jewelry making (cabochons), tumbled stones for collecting, and ornamental carvings.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as the 'supreme nurturer' and has been used since antiquity for seals, amulets, and architectural ornamentation.
Field identification & locations
Identify by its opacity (even on thin edges), its deep red color, and its inability to be scratched by a steel knife. It is frequently found in riverbeds or as pebbles on beaches in regions with volcanic history.
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