mineral

Tumbled quartz-rich stone, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphic

AI-generated identification · may be incorrect

White to gray, translucent edges, vitreous to waxy luster, and irregular conchoidal-looking fractures from tumbling; quartz hardness is 7 Mohs, with no cleavage and specific gravity about 2.65. The layered gray interior may indicate quartzite or a quartz-bearing composite rather than pure quartz.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich fluids or igneous melts; quartzite forms when sandstone is metamorphosed and recrystallized. Its exact geological age and locality cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and decorative objects; attractive polished pieces are used as inexpensive cabochons or display stones.

Geological facts

The rounded edges and glossy surface indicate human tumbling or polishing. Gray banding and dark inclusions could represent mica, clay, iron oxides, or other mineral impurities.

Field identification & locations

Test with a steel file or glass: genuine quartz should scratch ordinary glass and resist a steel blade. Common examples occur worldwide, especially in hydrothermal veins, granites, and metamorphic quartzite terrains.