mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 Mohs; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 Mohs
Color: White to translucent
Luster: Vitreous to greasy

Identified April 9, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Forms through the crystallization of silica-rich hydrothermal fluids in veins or as a primary mineral in igneous and metamorphic environments. Its white color is caused by tiny fluid inclusions trapped during crystal growth.

Uses & applications

Used as a source of silicon for semiconductors, in ceramics, as an abrasive, and widely used in landscaping and costume jewelry.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was used by many cultures to produce stone tools when flint was unavailable.

Field identification & locations

Identify by its hardness (scratches glass), white color, and waxy luster. It is found globally, particularly in mountainous regions with granite and hydrothermal veins.