mineral

Milky Quartz

Silicon Dioxide (SiO2)

Mohs hardness: 7; Color: White to cloudy/translucent; Luster: Vitreous to greasy; Crystal system: Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7
Color: White to cloudy/translucent
Luster: Vitreous to greasy

Identified May 1, 2026More mineral →

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Physical properties

Mohs hardness: 7; Color: White to cloudy/translucent; Luster: Vitreous to greasy; Crystal system: Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Forms during the cooling of hydrothermal veins or as a secondary mineral in magmatic processes. It can be found in almost any geological environment including igneous, metamorphic, and sedimentary rocks.

Uses & applications

Used in glassmaking, abrasives, decorative stone, landscaping, and as a common specimen for beginner collectors. High-purity quartz is used in electronics.

Geological facts

Milky quartz gets its cloudy appearance from microscopic inclusions of fluid (gas or liquid) trapped during crystal growth. It is one of the most common minerals on Earth's crust.

Field identification & locations

Identify in the field by its hardness (it can scratch glass), lack of cleavage, and white, waxy or crystalline appearance. Found globally in mountainous regions and riverbeds.