sedimentary
Jasper and Quartz Pebble
Silicon dioxide (SiO2) microcrystalline quartz variety
Hardness of 6.5-7 on the Mohs scale, colors include reddish-brown jasper mixed with white/translucent quartz, vitreous to waxy luster, trigonal crystal system (microcrystalline), conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, colors include reddish-brown jasper mixed with white/translucent quartz, vitreous to waxy luster, trigonal crystal system (microcrystalline), conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed through the deposition and precipitation of silica-rich fluids in cavities or sedimentary layers, often rounded and polished by water transport in rivers or beaches over geological time scales.
Uses & applications
Used in lapidary arts, tumbled stones, ornamental carvings, and gemstone jewelry.
Geological facts
Jasper is an aggregate of microgranular quartz and/or chalcedony and other mineral phases, known for its rich opaque colors often banded or patterned by impurities like iron oxides.
Field identification & locations
Commonly found in gravel bars, riverbeds, and coastal beaches. Identified easily by its high hardness (scratches glass) and smooth, water-worn appearance with opaque reddish and white banding.
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