mineral

Quartz (Milky/Granular)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent grey with orange/iron staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Milky white to translucent grey with orange/iron staining
Luster: Vitreous to greasy

Identified April 3, 2026More mineral →

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Physical properties

Formation & geological history

Formed from the crystallization of silica-rich magma or precipitation from hydrothermal veins. It can be found in a vast range of geological ages from Precambrian to recent.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), construction as an aggregate, and as a semi-precious gemstone in jewelry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which originally meant 'hard'.

Field identification & locations

Identify in the field by its hardness (it will scratch glass and steel), lack of cleavage, and glassy appearance on fresh surfaces. Found globally in almost all rock types.