mineral
Tumbled quartz pebble, possibly citrine or pale smoky quartz
Quartz (SiO₂), likely microcrystalline/tumbled material
AI-generated identification · may be incorrectTranslucent honey-yellow to gray-brown, vitreous luster, rounded polished surface, and no visible cleavage; quartz has Mohs hardness 7 and specific gravity about 2.65. Internal veils and fractures are typical of natural quartz.
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Physical properties
Translucent honey-yellow to gray-brown, vitreous luster, rounded polished surface, and no visible cleavage; quartz has Mohs hardness 7 and specific gravity about 2.65. Internal veils and fractures are typical of natural quartz.
Formation & geological history
Quartz crystallizes from silica-rich hydrothermal fluids and igneous melts; yellow coloration may result from iron impurities or heat treatment. The specimen’s geological age cannot be determined from the image.
Uses & applications
Used as a decorative stone, jewelry bead, crystal specimen, and abrasive; quality transparent material may be faceted as citrine. Common tumbled pieces have modest value.
Geological facts
Quartz is one of Earth’s most abundant minerals and forms in igneous, metamorphic, and sedimentary environments. Citrine is naturally uncommon, so much commercial “citrine” is heat-treated amethyst.
Field identification & locations
Common in quartz veins, pegmatites, metamorphic rocks, and alluvial gravels worldwide, especially Brazil, Madagascar, and the United States. A glass scratch test can help confirm hardness, but treatment and exact variety require testing.
