mineral

Milky Quartz (Pebble)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Translucent to opaque white. Luster: Vitreous (glassy) to greasy. Crystal structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Translucent to opaque white
Luster: Vitreous (glassy) to greasy

Identified January 24, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins or pegmatites when silica-rich fluids cool. Milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. Can be found in rocks of almost any geological age.

Uses & applications

Commonly used in glassmaking, abrasives, and as a source of silicon for electronics. In jewelry, it is used for beads and cabochons. Frequently used in landscaping and as a decorative stone.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is often found in the core of pegmatites and can occur in massive veins that span miles. In folklore, it is sometimes referred to as 'Snow Quartz'.

Field identification & locations

Identify in the field by its high hardness (it will easily scratch glass or a steel knife) and lack of cleavage (it breaks in curved, shell-like patterns). It is common in riverbeds and mountainous areas where it resists weathering better than surrounding minerals.