mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White or cloudy, Luster: Vitreous/waxy, Crystal structure: Hexagonal/Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified June 1, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: White or cloudy, Luster: Vitreous/waxy, Crystal structure: Hexagonal/Trigonal, 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 secondary mineral in igneous and metamorphic environments. Can be found in rocks from almost any geological age.

Uses & applications

Used as an abrasive, in glassmaking, construction aggregate, and as a decorative stone/gemstone for collecting and metaphysical purposes.

Geological facts

The 'milky' appearance is caused by tiny inclusion of gas or liquid trapped during the crystal's growth. It is one of the most abundant minerals on Earth's crust.

Field identification & locations

Identify by its hardness (scratches glass), white color, and lack of cleavage. Commonly found in riverbeds, mountains, and as 'veins' in larger rock formations. Essential for field collectors as a primary reference for Mohs hardness scale.