mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to cream with rusty-brown staining, vitreous to pearly luster, and translucent areas. Trigonal crystal structure; no cleavage, with irregular to conchoidal fracture. The rough, massive pieces are consistent with quartz, though the photo alone cannot confirm the identification.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins and cavities, or during igneous and metamorphic processes. Quartz is found in rocks of many ages, from ancient Precambrian formations to recent veins.

Uses & applications

Used in glassmaking, ceramics, electronics, and construction aggregate; attractive pieces are kept as inexpensive mineral specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and can form large vein masses. Brown patches may be iron-oxide staining.

Field identification & locations

Look for its glassy sheen, lack of cleavage, and ability to scratch ordinary glass; common in quartz veins worldwide. Confirm with a hardness test and, if needed, professional mineral analysis.