mineral

Tumbled quartz crystal fragment

Quartz, silicon dioxide (SiO₂), likely iron-stained or included quartz

AI-generated identification · may be incorrect

Small rounded specimen with translucent brown-gray color, vitreous-to-waxy luster, and irregular fracture; quartz hardness is Mohs 7, with no cleavage and a trigonal crystal structure. The brown coloration likely comes from iron-oxide staining or inclusions.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, hydrothermal, and metamorphic environments when silica-rich fluids or melts crystallize; individual crystals may be Precambrian to recent. Its rounded shape indicates natural abrasion or tumbling by water or a polishing process.

Uses & applications

Used in glass, electronics, abrasives, and construction; attractive clear or colored varieties are cut for jewelry. This small included piece has modest specimen value.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly develops six-sided prisms, though this specimen is too rounded to show crystal form.

Field identification & locations

Identify quartz by its glassy luster, lack of cleavage, hardness sufficient to scratch ordinary glass, and typically conchoidal fracture; common worldwide, especially in hydrothermal veins and quartz-rich gravels. Estimated value: $1–$5 for a small common tumbled or stained piece.