mineral

Tumbled quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Likely milky or rose quartz: translucent cream-white, vitreous to waxy luster, hardness 7 Mohs, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65.

Identified August 25, 2026More mineral →

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Physical properties

Likely milky or rose quartz: translucent cream-white, vitreous to waxy luster, hardness 7 Mohs, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65.

Formation & geological history

Quartz crystallizes from silica-rich igneous or hydrothermal fluids and may later weather into rounded cobbles; this specimen has been mechanically tumbled and polished. Quartz formed throughout geologic time, commonly in veins and pegmatites.

Uses & applications

Used for decorative stone, lapidary work, carvings, countertops, glass, electronics, and watches; this small tumbled piece has modest collecting or craft value.

Geological facts

Quartz is one of Earth’s most abundant minerals and exhibits piezoelectricity. The rounded shape and smooth surface indicate human tumbling rather than natural crystal growth.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and inability to be scratched by a steel knife. Common sources include Brazil, Madagascar, the United States, and many other regions.