mineral
Tumbled quartz pebble, possibly citrine or iron-stained quartz
Quartz (SiO₂), likely microcrystalline or granular quartz
AI-generated identification · may be incorrectSmall rounded translucent yellow-brown specimen with a vitreous-to-waxy luster and no obvious cleavage; quartz hardness is Mohs 7, specific gravity about 2.65, and it has a hexagonal crystal structure. Surface texture and color may result from tumbling and iron-oxide staining.
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Physical properties
Small rounded translucent yellow-brown specimen with a vitreous-to-waxy luster and no obvious cleavage; quartz hardness is Mohs 7, specific gravity about 2.65, and it has a hexagonal crystal structure. Surface texture and color may result from tumbling and iron-oxide staining.
Formation & geological history
Quartz forms in igneous, hydrothermal, and sedimentary environments across a wide range of geological ages; yellow coloration can arise from iron impurities or natural irradiation. The rounded shape indicates water wear or human tumbling.
Uses & applications
Used as a decorative/collectible stone, gemstone material, abrasives, and in glass and electronics; this small piece has little commercial value.
Geological facts
True citrine is relatively uncommon, while much marketed citrine is heat-treated amethyst. A glassy luster, lack of cleavage, and inability to scratch it with a steel knife support quartz identification.
Field identification & locations
Common in quartz veins, gravels, pegmatites, and geodes worldwide; test with a steel file or glass (quartz should scratch glass), but confirmatory testing is needed to distinguish citrine from stained quartz or glass.
