mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

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

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

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed from the crystallization of magma or via hydrothermal activity in veins. These specimens likely weathered out of a hydrothermal vein. Geological age varies greatly but quartz is found in crustal rocks of all ages.

Uses & applications

Used in glassmaking, abrasives, foundry sand, and as a raw material in the electronics industry for silicon wafers. Also used as ornamental stone and in landscaping.

Geological facts

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

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Look for the distinct 'waxy' or glass-like luster on fresh surfaces. Commonly found in mountainous regions, riverbeds, and as garden stones worldwide.