mineral

Milky quartz (likely quartz vein fragment)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent, glassy-to-waxy luster with rough granular fracture; Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The specimen appears weathered and may contain minor mica or feldspar inclusions.

Identified August 27, 2026More mineral →

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Physical properties

Formation & geological history

Usually forms when silica-rich hydrothermal fluids fill fractures in igneous or metamorphic rocks, commonly during Precambrian to younger geological events. Its cloudy appearance results from microscopic fluid inclusions, fractures, or impurities.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive pieces are collected but generally have little jewelry value unless exceptionally clear or well crystallized.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, so it commonly accumulates in stream gravels and soils.

Field identification & locations

Identify it by its hardness— it should scratch ordinary glass—and its lack of cleavage; unlike calcite, it will not fizz in dilute acid. Common worldwide, especially in granite and metamorphic terrains; this rough fragment is typically worth about $1–$10, or up to $20 for an unusually attractive specimen.