mineral

Tumbled clear quartz (likely milky quartz)

Quartz, SiO₂

AI-generated identification · may be incorrect

Mohs hardness 7; translucent to cloudy white with faint orange staining, vitreous luster, and hexagonal crystal structure. Quartz has no true cleavage and breaks with conchoidal fracture; specific gravity about 2.65.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms in many igneous, metamorphic, and sedimentary settings, commonly crystallizing from silica-rich fluids in veins and cavities. The pictured rounded shape is mechanically tumbled; its geological age cannot be determined from the image.

Uses & applications

Commonly used for jewelry, ornaments, glassmaking, and electronics; this small tumbled specimen is mainly decorative or collectible.

Geological facts

Quartz is one of Earth’s most abundant minerals and occurs in a wide range of colors and crystal habits.

Field identification & locations

Identify by its glassy appearance, hardness sufficient to scratch ordinary glass, and lack of cleavage; the orange areas may be iron-oxide staining. Quartz is found worldwide, including Brazil, Madagascar, and the United States.