mineral

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Hardness: 7.0 on Mohs scale. Color: White to translucent gray. Luster: Vitreous to greasy. Crystal structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.

Hardness: 7
Color: White to translucent gray
Luster: Vitreous to greasy

Identified April 9, 2026More mineral →

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Physical properties

Hardness: 7.0 on Mohs scale. Color: White to translucent gray. Luster: Vitreous to greasy. Crystal structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions or magma. Milky quartz specifically gets its appearance from tiny fluid inclusions of gas or liquid trapped during crystal growth. Found in almost all geological ages.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as a gemstone or decorative stone in jewelry and landscaping.

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, often forming the 'white veins' seen in other rock types.

Field identification & locations

Identify in the field by its hardness (it will easily scratch glass) and lack of cleavage. It is commonly found in riverbeds, mountains, and as gravel. Its high resistance to weathering makes it a primary component of sand.

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