mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to cream (due to fluid inclusions); Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to cream (due to fluid inclusions)
Luster: Vitreous to greasy

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. It is found in all geological ages and environments, particularly in igneous rocks like granite and metamorphic rocks like quartzite.

Uses & applications

Used in glassmaking, abrasives, foundry sand, and as a component in concrete and mortar. In higher quality, it is used for jewelry and as a popular collector's mineral.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its characteristic white color from microscopic bubbles of gas or liquid trapped during the crystal's formation.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), its lack of cleavage, and its waxy or vitreous appearance. Commonly found in riverbeds, mountain ranges, and garden soil virtually worldwide.