mineral

Tumbled quartz (likely smoky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent gray-brown to olive-brown color, vitreous luster, and irregular conchoidal fracture. Quartz is trigonal and lacks cleavage; the rounded edges indicate tumbling or natural abrasion.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, hydrothermal, and metamorphic fluids, with deposits ranging from Precambrian to recent age. The specimen’s color may reflect irradiation, trace iron, or surface staining.

Uses & applications

Used for glass, ceramics, abrasives, electronics, and countertops; transparent attractive varieties are used as gemstones. This small rough/tumbled piece has modest collector value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is a major component of granite, sandstone, and many veins.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; confirm with a hardness test and inspect for bubbles, which would suggest glass. Common worldwide, especially in hydrothermal veins and granitic terrains.