mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Translucent white to milky opaque; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Translucent white to milky opaque
Luster: Vitreous to greasy

Identified May 15, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Translucent white to milky opaque; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & geological history

Formed primarily in hydrothermal veins and pegmatites through the crystallization of silica-rich fluids. It is one of the most common minerals on Earth, appearing in almost every geological age and environment.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), various construction materials, and as decor or landscaping stones. High-quality specimens are used in jewelry and holistic collecting.

Geological facts

The milky color is caused by microscopic fluid inclusions of gas and/or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identified in the field by its hardness (scratches glass), lack of cleavage, and common occurrences in veins within metamorphic or igneous rocks. Found globally, especially in mountain ranges and riverbeds.