sedimentary
Red Jasper (River Pebble)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Hardness 6.5 to 7 on Mohs scale; reddish-brown color with opaque luster; microcrystalline structure; smooth river-worn texture; high specific gravity (approx 2.7).
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Physical properties
Hardness 6.5 to 7 on Mohs scale; reddish-brown color with opaque luster; microcrystalline structure; smooth river-worn texture; high specific gravity (approx 2.7).
Formation & geological history
Formed from the hydrothermal deposition of silica or during the consolidation of fine-grained volcanic ash and clay, later rounded and smoothed by water transport in a river environment.
Uses & applications
Used primarily in lapidary work for cabochons, river landscaping, decorative accents, and as a metaphysical grounding stone.
Geological facts
Jasper is a variety of chalcedony that is always opaque. Ancient Egyptians often associated red jasper with the blood of Isis, using it in ritual amulets and protective jewelry.
Field identification & locations
Commonly found in river beds, beaches, and desert plains globally. Identified in the field by its opacity, intense red color (which creates a streak that isn't red), and its inability to be scratched by a steel knife.
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