Yellow Quartz (Chalcedony/Citrine Pebble)

Physical Properties

Hardness: 7 (Mohs scale), Color: Pale yellow to honey gold, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (Trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & Geological History

Formed from silica-rich hydrothermal fluids or within volcanic cavities. This specific specimen appears to be water-worn, smoothed by alluvial/river activity over thousands of years.

Uses & Applications

Used primarily for ornamental purposes, pocket stones, decorative gravel, or as a gemstone in affordable jewelry.

Geological Facts

Naturally occurring yellow quartz is somewhat rare in deep hues; many deep orange 'citrines' on the market are actually heat-treated amethyst, but pale pebbles like this are often natural river quartz with iron inclusions.

Field Identification & Locations

Identify by its ability to scratch glass and its lack of cleavage. Look for the 'waxy' smoothness on the surface of these river-tumbled specimens in stream beds or beach deposits.

Identified on: 4/13/2026

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