sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale; dull to waxy luster; greenish-grey with mustard yellow and dark inclusions; smooth water-worn texture; microcrystalline structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale; dull to waxy luster; greenish-grey with mustard yellow and dark inclusions; smooth water-worn texture; microcrystalline structure.
Formation & geological history
Formed through the accumulation and silicification of fine-grained sediments or volcanic ash, often weathered and rounded by river or ocean transport.
Uses & applications
Commonly used for lapidary arts, tumbling, jewelry (cabochons), landscape decoration, and rock collecting.
Geological facts
Jasper is an opaque variety of chalcedony that gets its distinct color patterns from impurities like iron oxides and clay minerals.
Field identification & locations
Identify by its hardness (scratches glass), waxy smoothness, and opacity. Commonly found in stream beds, beach gravels, and alluvial deposits.
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