mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 (Mohs scale); Color: White to translucent yellow; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White to translucent yellow
Luster: Vitreous to greasy

Identified April 7, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White to translucent yellow; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids in veins or as a late-stage mineral in igneous pegmatites. The white/milky appearance is caused by microscopic fluid inclusions trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, electronics (as oscillators), and frequently as a landscaping stone or in lapidary work for cabochons and tumbled stones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically gets its color from tiny bubbles of gas or liquid trapped within the crystal structure millions of years ago.

Field identification & locations

Identify in the field by its hardness (will scratch glass and steel), lack of cleavage, and waxy/vitreous luster on fresh surfaces. Commonly found in riverbeds, mountains, and mining veins.