mineral

Likely tumbled quartz or chalcedony fragment

Quartz (SiO₂), possibly microcrystalline chalcedony

AI-generated identification · may be incorrect

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.

Identified August 24, 2026More mineral →

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Physical properties

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.