mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale). Color: White to translucent/opaque. Luster: Vitreous (glassy) to greasy. Crystal structure: Hexagonal/Trigonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: White to translucent/opaque
Luster: Vitreous (glassy) to greasy

Identified March 29, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale). Color: White to translucent/opaque. Luster: Vitreous (glassy) to greasy. Crystal structure: Hexagonal/Trigonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions or cooling magma. Milky appearance is caused by tiny inclusions of liquid, gas, or both, trapped during crystal growth. Common in igneous (pegmatites) and metamorphic environments across all geological ages.

Uses & applications

Used back in history for tools; currently used in glassmaking, abrasives, electronics (piezoelectric properties), landscaping, and as decorative pocket stones or 'worry stones' in the metaphysical community.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. The white color is often referred to as 'snow quartz'. While it is abundant, highly pure quartz is essential for manufacturing silicon chips for computers.

Field identification & locations

Identify in the field by its hardness (it will easily scratch glass) and its lack of cleavage planes. It is found globally, often in veins within granite or as rounded pebbles in stream beds. For collectors, look for specimens with distinct crystal faces rather than rough chunks.