mineral
Tumbled quartz, likely citrine or iron-stained quartz
Quartz (SiO₂); the orange-brown color may result from iron-oxide staining
AI-generated identification · may be incorrectTranslucent, honey-to-brown, rounded and polished, with vitreous luster; Mohs hardness 7 and trigonal crystal structure. The photo does not show enough detail to distinguish citrine from stained or included quartz confidently.
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Physical properties
Translucent, honey-to-brown, rounded and polished, with vitreous luster; Mohs hardness 7 and trigonal crystal structure. The photo does not show enough detail to distinguish citrine from stained or included quartz confidently.
Formation & geological history
Quartz forms in igneous and hydrothermal settings and in veins; the pictured piece has been mechanically tumbled. Quartz occurs in rocks spanning much of geologic time.
Uses & applications
Used in jewelry, ornaments, and collections; quartz is also important in glassmaking and electronics.
Geological facts
Natural citrine is relatively uncommon; much commercial citrine is heat-treated amethyst, while iron staining can also produce yellow-brown colors.
Field identification & locations
Look for glassy luster, translucency, and hardness sufficient to scratch ordinary glass; color alone cannot confirm citrine. Quartz is widespread worldwide.
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