mineral
Tumbled golden-brown crystal, possibly citrine or quartz
Quartz (SiO₂), tentatively iron-stained or heat-treated citrine
AI-generated identification · may be incorrectHardness 7 Mohs; translucent honey-brown color, vitreous luster, and likely quartz’s hexagonal crystal structure, though tumbling obscures faces and cleavage. The elongated striated appearance may also indicate another mineral, so image-only identification is uncertain.
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Physical properties
Hardness 7 Mohs; translucent honey-brown color, vitreous luster, and likely quartz’s hexagonal crystal structure, though tumbling obscures faces and cleavage. The elongated striated appearance may also indicate another mineral, so image-only identification is uncertain.
Formation & geological history
Quartz forms in hydrothermal veins and igneous cavities over broad geological timescales; iron impurities create yellow-brown coloration. Natural citrine is relatively uncommon, while much commercial citrine is amethyst heated in the laboratory.
Uses & applications
Used as a lapidary, ornamental, and collectible stone; quartz is also important in glass, electronics, abrasives, and construction. This piece appears suitable mainly for collecting or decoration.
Geological facts
Quartz has a Mohs hardness of 7 and commonly shows conchoidal fracture rather than cleavage. A streak test, hardness test, and examination of crystal faces would help distinguish it from yellow beryl, feldspar, or tiger’s-eye.
Field identification & locations
Common sources include Brazil, Uruguay, Madagascar, Spain, and the United States. Check whether it scratches glass, inspect for quartz-like conchoidal fracture, and avoid destructive testing if valuable.
