sedimentary
Agate Pebble / Quartz Pebble
Cryptocrystalline Quartz (SiO2)
Hardness 6.5 to 7 on the Mohs scale, translucent to waxy luster, yellow-brown to amber color, conchoidal fracture, lack of distinct cleavage.
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Physical properties
Hardness 6.5 to 7 on the Mohs scale, translucent to waxy luster, yellow-brown to amber color, conchoidal fracture, lack of distinct cleavage.
Formation & geological history
Formed via secondary silica deposition in cavities of host rocks or as water-worn stream/beach pebbles where fine-grained chalcedonic quartz aggregates.
Uses & applications
Commonly used for lapidary work, tumbling, jewelry beads, decorative stone collections, and ornamental carving.
Geological facts
Smooth, rounded water-worn quartz pebbles are among the most common beach and river finds worldwide. Transparent to translucent amber chalcedony is often called carnelian or honey agate.
Field identification & locations
Identified by its waxy-to-glassy luster, translucent yellowish-tan body, and smooth rounded pebble texture. Commonly found along riverbeds, gravel bars, and ocean beaches.
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