sedimentary
Jasper (Red/Brown Jasper)
Microcrystalline Quartz (SiO2 with iron oxide impurities)
AI-generated identification · may be incorrectMohs hardness 6.5–7, deep brownish-red color, dull to waxy/smooth tumbled luster, cryptocrystalline structure, conchoidal fracture.
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Physical properties
Mohs hardness 6.5–7, deep brownish-red color, dull to waxy/smooth tumbled luster, cryptocrystalline structure, conchoidal fracture.
Formation & geological history
Formed by precipitation of silica from groundwater into cavities or sediment pores, often influenced by volcanic or sedimentary environments.
Uses & applications
Commonly used in lapidary arts, jewelry, decorative tumbled stones, and ornamental carvings.
Geological facts
Jasper has been utilized since antiquity for seals and talismans; its opaque coloration is primarily caused by iron inclusions.
Field identification & locations
Identify by its hardness (scratches glass), lack of crystal faces, smooth break, and opacity. Abundant worldwide in riverbeds and gravel deposits.
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