mineral

Milky Quartz

Silicon Dioxide (SiO2)

Mohs hardness of 7, white to translucent color, vitreous luster (waxy when weathered), trigonal crystal system, conchoidal fracture (no cleavage), specific gravity of 2.65.

Identified July 19, 2026More mineral →

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Physical properties

Mohs hardness of 7, white to translucent color, vitreous luster (waxy when weathered), trigonal crystal system, conchoidal fracture (no cleavage), specific gravity of 2.65.

Formation & geological history

Forms primarily in hydrothermal veins and pegmatites through the cooling and crystallization of silica-rich hot fluids. It can be found in rocks of all ages, from Precambrian to Cenozoic.

Uses & applications

Used as an abrasive, in the production of glass and silicon, as flux in metallurgy, and widely in landscaping or as crushed stone. Some varieties are used in cheap jewelry or as energy-healing stones.

Geological facts

The milky white color is caused by millions of tiny fluid inclusions (gas or liquid bubbles) trapped during the crystal's growth. It is the most common variety of crystalline quartz on Earth.

Field identification & locations

Identify by its white color and ability to scratch glass. It will not react with acid like calcite. It is found globally along riverbeds, mountainsides, and in gravel pits. Focus on consistency and lack of cleavage.