mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to yellowish-tan due to impurities; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Cloudy white to yellowish-tan due to impurities
Luster: Vitreous to greasy

Identified April 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. This specific specimen appears to be a water-worn or weathered pebble likely sourced from a stream or alluvial deposit.

Uses & applications

Used in the production of glass, ceramics, and abrasives. Historically used for making tools; currently popular as a garden stone or for metaphysical collecting.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The 'cloudy' or 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Field identification & locations

Identify in the field by its ability to scratch glass, its lack of cleavage, and its waxy/greasy luster on broken surfaces. It is ubiquitous in riverbeds and mountainous regions worldwide.