mineral
Likely tumbled quartz or chalcedony fragment
Quartz (SiO₂), possibly microcrystalline chalcedony
AI-generated identification · may be incorrectSmall honey-yellow, translucent fragment with a vitreous to waxy luster and irregular fracture; quartz hardness is Mohs 7, while chalcedony is approximately 6.5–7. The image is partially obscured by textured glass, so crystal form and exact composition cannot be confirmed.
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Physical properties
Small honey-yellow, translucent fragment with a vitreous to waxy luster and irregular fracture; quartz hardness is Mohs 7, while chalcedony is approximately 6.5–7. The image is partially obscured by textured glass, so crystal form and exact composition cannot be confirmed.
Formation & geological history
Quartz forms in hydrothermal veins, cavities, and sedimentary or metamorphic settings; yellow coloration may result from iron staining or inclusions. Quartz ranges from Precambrian to modern in age and is globally widespread.
Uses & applications
Used for glass, ceramics, electronics, abrasives, countertops, and decorative specimens; attractive transparent pieces may be cut as citrine or other quartz gemstones.
Geological facts
A conchoidal fracture, lack of cleavage, and ability to scratch ordinary glass support quartz identification. Color alone is unreliable because heat treatment and iron staining can produce yellow tones.
Field identification & locations
Common sources include Brazil, Madagascar, the United States, and worldwide quartz-bearing veins; test only with care using hardness and streak tests. Likely value is $1–$10 for a small common fragment, or $10–$50 if gem-quality.
