mineral

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white with brownish/grayish iron inclusions; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white with brownish/grayish iron inclusions
Luster: Vitreous to greasy

Identified February 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed from hydrothermal solutions circulating through crustal fractures, typically associated with igneous intrusions or tectonic activity. Most milky quartz results from microscopic fluid inclusions trapped during crystallization.

Uses & applications

Used in glassmaking, as an abrasive, in the production of silicon metal, and widely used as landscaping stone or decorative aggregate in construction. High-purity quartz is used in electronics.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it has been used for stone tools and as a source for gold, as native gold is frequently found within quartz veins.

Field identification & locations

Identify in the field by its hardness (will scratch glass), white opaque color, and lack of cleavage. Commonly found in riverbeds, glacial till, and mountains. This specimen shows 'boxwork' or fractured weathering patterns where softer minerals or iron oxides have leeched out.

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