mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: White to translucent
Luster: Vitreous (glassy) to greasy

Identified April 9, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed from the cooling of silica-rich magma or through hydrothermal activity in veins. It is found in all types of geological environments and can date back billions of years depending on the host rock formation.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), countertops, and as a common landscape or decorative stone. High-purity quartz is essential for silicon chip manufacturing.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The white color in 'Milky Quartz' is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth.

Field identification & locations

Identify in the field by its ability to scratch glass and steel, its lack of cleavage, and its waxy or glassy luster. It is ubiquitous and commonly found in granitic terrains, mountain ranges, and riverbeds.