mineral

Milky Quartz in Matrix

Silicon Dioxide (SiO2)

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

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

Identified May 2, 2026More mineral →

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Physical properties

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

Formation & geological history

Quartz forms in a wide variety of environments, most commonly from the cooling of magma or by hydrothermal precipitation in veins. Milky quartz specifically contains tiny fluid inclusions that scatter light. It can form in almost any geological age.

Uses & applications

Industrial uses as an abrasive, in glassmaking, and in electronics for its piezoelectric properties. Culturally used for decorative carvings, lapidary work, and as a popular collector specimen.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Its white color is caused by microscopic inclusions of gas or liquid trapped during the crystal's growth.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and white color. It is found globally in igneous, metamorphic, and sedimentary settings, often in veins or as pebbles in stream beds.