sedimentary
Jasper / Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, colors ranging from white to brown and reddish-brown due to iron oxide impurities, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture with no cleavage, specific gravity of approximately 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, colors ranging from white to brown and reddish-brown due to iron oxide impurities, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture with no cleavage, specific gravity of approximately 2.65.
Formation & geological history
Formed through the deposition of silica-rich fluids or silty sediments in ancient marine or terrestrial environments, subsequently weathered, transported, and naturally tumbled by water into a smooth pebble.
Uses & applications
Commonly used in lapidary arts, wire-wrapping, jewelry making, tumbling, and as decorative pocket stones for collectors.
Geological facts
Jasper is an ancient gemstone mentioned in various historical texts including the Bible. The brown patterns often indicate iron or clay inclusions trapped during the rapid crystallization of microcrystalline quartz.
Field identification & locations
Easily identified in the field by its high hardness (scratches glass), smooth water-worn surface, and lack of cleavage. Found worldwide in riverbeds, beaches, and glacial till.
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