mineral

Tumbled milky quartz

Quartz, SiO₂

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent gray with brown iron-oxide staining, vitreous-to-waxy luster, and no visible cleavage. Trigonal crystal structure; the rounded, rectangular form indicates tumbling or cutting.

Identified August 7, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, or metamorphic veins; its exact geological age and source cannot be determined from the image. Brown coloration is likely surface or fracture staining by iron oxides.

Uses & applications

Common as a low-cost lapidary, teaching, and collectible specimen; polished quartz is also used ornamentally and industrially in glass, ceramics, abrasives, and electronics.

Geological facts

Quartz is one of Earth’s most abundant minerals and is resistant to weathering, making it common in sediments and veins.

Field identification & locations

Identify by its glassy/waxy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and typically white translucent body. Common worldwide, especially in quartz veins and pegmatites.