sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness 6.5–7 on the Mohs scale, waxy to dull luster, conchoidal fracture, and a smooth, water-worn reddish-tan surface.
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Physical properties
Hardness 6.5–7 on the Mohs scale, waxy to dull luster, conchoidal fracture, and a smooth, water-worn reddish-tan surface.
Formation & geological history
Formed from silica-rich fluids precipitating in sedimentary or volcanic cavities, subsequently smoothed by fluvial or coastal erosion.
Uses & applications
Commonly collected as tumbled stones, polished into cabochons for jewelry, or used decoratively in landscaping.
Geological facts
Jasper derives its earthy red and brown tones from microscopic inclusions of iron oxides such as hematite and goethite.
Field identification & locations
Identify by its hardness (scratches glass), lack of visible crystalline grain, and opaque appearance; common in riverbeds and gravel bars worldwide.
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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