sedimentary
Jasper / Quartz Pebble
Silicon Dioxide (SiO2) with microcrystalline impurities
Hardness of 7 on the Mohs scale, waxy to vitreous luster, opaque to translucent, conchoidal fracture, specific gravity around 2.65, white or creamy base with reddish-brown to dark spots and banding.
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Physical properties
Hardness of 7 on the Mohs scale, waxy to vitreous luster, opaque to translucent, conchoidal fracture, specific gravity around 2.65, white or creamy base with reddish-brown to dark spots and banding.
Formation & geological history
Formed through the deposition of silica-rich fluids or silty sediments in ancient marine or terrestrial environments, subsequently lithified and smoothed by water action (weathering and erosion in rivers or beaches) over millions of years.
Uses & applications
Commonly collected as a lapidary specimen, used for making tumbled stones, cabochons, and simple jewelry or decorative items.
Geological facts
Jasper is an aggregate of microgranular quartz and/or chalcedony and other mineral phases. The colorful red and brown patterns are typically caused by iron oxide inclusions.
Field identification & locations
Found worldwide in stream beds, gravel bars, and ocean beaches. Identified by its high hardness (scratches glass), smooth waterworn surface, and lack of cleavage.
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