mineral
Yellow Jasper
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
Hardness 6.5-7 on Mohs scale, dull to vitreous/waxy luster, opaque, microcrystalline trigonal structure, highly smooth rounded river-pebble texture, yellowish-brown to dark greenish-grey mottling.
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Physical properties
Hardness 6.5-7 on Mohs scale, dull to vitreous/waxy luster, opaque, microcrystalline trigonal structure, highly smooth rounded river-pebble texture, yellowish-brown to dark greenish-grey mottling.
Formation & geological history
Formed through silica sedimentation and mineralization processes where fine quartz grains crystallized with limonite or iron hydroxide impurities. Often smoothed naturally by aqueous erosion in river beds or ocean shores.
Uses & applications
Used primarily for lapidary arts, stone carving, tumbled pocket stones, jewelry beads, and decorative mineral collections.
Geological facts
Yellow Jasper has been used since ancient times in amulets and seals. Its yellow color is derived from iron oxide minerals integrated into the quartz lattice.
Field identification & locations
Identified by its high hardness (scratches glass), smooth waxy feel when wet or polished, and complete opacity with mottled earthy patterns. Commonly found along stream beds, gravel bars, and beaches worldwide.
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