mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Opaque white to translucent
Luster: Vitreous to greasy

Identified June 14, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65.

Formation & geological history

Formed in hydrothermal veins or pegmatites when silica-rich fluids cool. The white color comes from tiny fluid inclusions of gas or liquid trapped during crystal growth. Can be found in rocks from almost any geological age.

Uses & applications

Used in glass making, as an abrasive, in the electronics industry for its piezoelectric properties, and as a semi-precious gemstone in jewelry or decorative carvings.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. It often contains microscopic 'vugs' or bubbles that scatter light, creating its signature snowy appearance. It is sometimes associated with gold deposits in quartz veins.

Field identification & locations

Identify by its white color, ability to scratch glass (hardness 7), and lack of cleavage (it breaks in irregular, shell-like curves). Very common in riverbeds, mountains, and gardens worldwide.