sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, opaque brown color, dull to waxy luster, microcrystalline or cryptocrystalline crystal structure, conchoidal fracture, specific gravity of 2.58-2.91.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque brown color, dull to waxy luster, microcrystalline or cryptocrystalline crystal structure, conchoidal fracture, specific gravity of 2.58-2.91.
Formation & geological history
Formed through the silification of sedimentary or volcanic deposits where silica-rich fluids precipitate microcrystalline quartz in pore spaces or fractures, shaped into a pebble by water tumbling in a river or coastal environment.
Uses & applications
Used for lapidary work, ornamental carvings, cabochons, jewelry making, and collected as a natural specimen.
Geological facts
Jasper is an aggregate of microgranular quartz and/or chalcedony and other mineral phases. Its rich brown and earthy tones come from iron oxide and hydroxide impurities trapped during formation.
Field identification & locations
Found widely in stream beds, gravel bars, and beaches. Identify by its high hardness (scratches glass), opaque appearance, smooth water-worn surface, and lack of visible crystal grains.
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