mineral

Milky Quartz

Quartz / Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Semi-translucent white or pale tan; Luster: Vitreous/waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Semi-translucent white or pale tan
Luster: Vitreous/waxy

Identified April 4, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Semi-translucent white or pale tan; Luster: Vitreous/waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed from the crystallization of silica-rich molten rock (magma) or from hydrothermal veins. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, jewelry (as decorative stones/beads), electronics (due to piezoelectric properties), and as a landscape stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is often called 'White Quartz' and can be found in massive forms that lack the distinct crystal points of clear quartz.

Field identification & locations

Identify in the field by its hardness (it will easily scratch glass) and lack of cleavage. It is extremely common worldwide, often appearing as veins in metamorphic rocks or as rounded pebbles in riverbeds.