mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous 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 to greasy

Identified March 29, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

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

Formation & geological history

Formed through hydrothermal processes, crystallization from cooling magma, or precipitation from silica-rich fluids in veins. Can be found in geological formations of almost any age.

Uses & applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, and as a semi-precious gemstone in jewelry and carving.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its characteristic white color from microscopic fluid inclusions trapped during the crystal's formation.

Field identification & locations

Identify in the field by its inability to be scratched by steel, its lack of cleavage, and the absence of a reaction to acid. Commonly found in riverbeds, mountains, and as veins within granite or schist.