sedimentary
Mixed River Pebbles and Jasper
Siliciclastic sediment and microcrystalline quartz
Hardness of 7 on the Mohs scale for the quartz/jasper components. Colors range from white, brown, to reddish-brown. Luster is vitreous to dull earthy. Crystal structure is microcrystalline or cryptocrystalline.
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Physical properties
Hardness of 7 on the Mohs scale for the quartz/jasper components. Colors range from white, brown, to reddish-brown. Luster is vitreous to dull earthy. Crystal structure is microcrystalline or cryptocrystalline.
Formation & geological history
Formed through weathering, erosion, and transport of various parent rocks by water action, resulting in smoothed, rounded pebble shapes found in riverbeds and streams.
Uses & applications
Landscaping, decorative garden stones, tumbling, and general rock collecting.
Geological facts
River pebbles show varying resistance to weathering, with quartz and jasper being exceptionally durable compared to softer minerals.
Field identification & locations
Commonly found in stream beds, riverbanks, and glacial drift deposits worldwide. Easily identified by their smooth, rounded surfaces.
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