mineral

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster with irregular fracture; Mohs hardness 7, no cleavage, hexagonal crystal structure, and specific gravity about 2.65. The rounded, uneven form suggests a naturally weathered or tumbled fragment.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; milky color commonly results from microscopic fluid inclusions. Quartz is abundant throughout geologic time, from Precambrian rocks to modern mineral veins.

Uses & applications

Used in glassmaking, ceramics, electronics, abrasives, construction aggregate, and ornamental objects; attractive transparent pieces may be cut as gemstones.

Geological facts

Quartz is one of Earth’s most abundant minerals and has strong piezoelectric properties. Milky quartz is generally less valuable than clear, smoky, or inclusion-rich varieties.

Field identification & locations

Identify it by its glassy appearance, hardness sufficient to scratch ordinary glass, lack of cleavage, and pale translucent color; common in granite, pegmatite, quartz veins, and stream gravels worldwide.