mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Milky white to opaque
Luster: Vitreous to greasy

Identified May 25, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65.

Formation & geological history

Formed in hydrothermal veins and pegmatites through the crystallization of silica-rich fluids. It can be found in a wide variety of geological environments and ages, often as a result of primary igneous crystallization or secondary metamorphic processes.

Uses & applications

Used in glass making, electronics (piezoelectric properties), abrasives, and as a semi-precious gemstone in jewelry and decor. Often collected as mineral specimens.

Geological facts

The 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. It is one of the most common minerals in the Earth's continental crust.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and white opaque color. It is commonly found in riverbeds, mountains, and as garden stones globally.