mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified June 20, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to opaque; 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 fluids in veins or as a late-stage mineral in igneous pegmatites. It can be found in rocks of almost any geological age.

Uses & applications

Used in glass making, abrasives, semiconductor industry, and as decorative stone or gravel in landscaping. Low-grade specimens are often used in construction aggregate.

Geological facts

The milky white color is caused by tiny bubbles of gas or liquid trapped during the crystal's growth. It is one of the most common minerals on Earth's crust.

Field identification & locations

Identify by its white color, hardness (it will scratch glass), and lack of cleavage. It is commonly found in riverbeds, mountains, and as garden stones. Collectors should look for unique shapes or large clusters.