mineral
Tumbled yellow quartz, possibly citrine
Quartz (SiO₂), likely iron-colored citrine or pale golden chalcedony
AI-generated identification · may be incorrectTranslucent yellow, vitreous-to-waxy luster, irregular tumbled shape, and no obvious cleavage; quartz hardness is Mohs 7, with specific gravity about 2.65. Internal fractures and color zoning are visible, but the image cannot confirm crystal structure or treatment.
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Physical properties
Translucent yellow, vitreous-to-waxy luster, irregular tumbled shape, and no obvious cleavage; quartz hardness is Mohs 7, with specific gravity about 2.65. Internal fractures and color zoning are visible, but the image cannot confirm crystal structure or treatment.
Formation & geological history
Quartz forms in hydrothermal veins and igneous cavities; yellow citrine derives mainly from iron impurities, while similar material may be heat-treated amethyst or dyed chalcedony. The specimen’s geological age is indeterminate and depends on its host deposit.
Uses & applications
Used as a lapidary stone, jewelry, ornamental material, and mineral specimen. Natural bright citrine is collectible, though much commercial citrine is heat-treated amethyst.
Geological facts
Its rounded surface indicates tumbling or polishing rather than a natural crystal face. Strong yellow color with cloudy translucency may also indicate yellow chalcedony or treated quartz.
Field identification & locations
Look for glassy luster, conchoidal fracture, absence of cleavage, and resistance to scratching by ordinary steel; quartz should not be scratched by a knife. Common sources include Brazil, Madagascar, Uruguay, and Zambia.
