mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: White to creamy tan due to iron staining; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to creamy tan due to iron staining
Luster: Vitreous to greasy

Identified May 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal veins or as a primary constituent in igneous rocks like granite. The milky appearance is caused by tiny fluid or gas inclusions trapped during crystal growth.

Uses & applications

Used in glassmaking, as an abrasive, in electronics (due to piezoelectric properties), and as decorative landscaping stone or tumbled pocket stones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz found in nature.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage planes. Frequently found in riverbeds, mountain outcrops, and as vein material in many geological environments.