mineral

Milky Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 Mohs; Color: White to translucent gray; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

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

Identified May 15, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: White to translucent gray; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Forms through the crystallization of silica-rich hydrothermal fluids in veins or as a primary constituent in igneous rocks like granite. It is found in all geological ages.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, construction aggregates, and semi-precious jewelry.

Geological facts

Milkiness is caused by tiny inclusions of gas or liquid trapped during crystal growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify by its hardness (scratches glass), waxy/glassy appearance, and lack of cleavage planes. Found globally in mountainous regions, riverbeds, and beach deposits.