mineral

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale. Color: Opaque white due to microscopic fluid inclusions. Luster: Vitreous to greasy. Crystal Structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.

Hardness: 7 on the Mohs scale
Color: Opaque white due to microscopic fluid inclusions
Luster: Vitreous to greasy

Identified March 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal solutions cooling in veins or from the crystallization of pegmatites. It is found in igneous, metamorphic, and sedimentary environments across all geological ages, often as the final mineral to crystallize in a cooling magma.

Uses & applications

Used in the production of glass, ceramics, and abrasives. High-purity quartz is essential for electronics and semiconductor manufacturing. In jewelry, it is used for tumbled stones, beads, and cabochons.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Its white color is caused by tiny gas or liquid bubbles trapped during the crystal's growth, which scatter light. Historically, it has been used for stone tools and ritual objects.

Field identification & locations

Identify by its ability to scratch glass, non-metallic luster, and lack of cleavage. It is found globally, particularly in mountainous regions like the Alps, Himalayas, and Appalachians. Collectors should look for well-formed hexagonal points.