mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to milky white; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to milky white
Luster: Vitreous to greasy

Identified June 10, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to milky white; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed from hydrothermal solutions or within pegmatites and igneous rocks. The cloudy appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. They can be found in rocks from many geological ages.

Uses & applications

Used in glassmaking, construction as aggregate, electronics (piezoelectric properties), and as inexpensive gemstones or decorative landscaping stones.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is often found as the 'vein' material that miners follow to find gold, as they frequently occur together.

Field identification & locations

Identified by its white, opaque appearance, hardness (it can scratch glass), and lack of cleavage. It is commonly found in riverbeds, mountains, and as garden stones worldwide.