mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Identified June 21, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed primarily in hydrothermal veins and pegmatites. The milky appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth. Can be found in geological environments spanning almost all ages.

Uses & applications

Used in glass making, abrasives, electronics (piezoelectric properties), and as a gemstone or decorative landscaping stone. Also popular in metaphysical and crystal collecting communities.

Geological facts

Milk quartz is the most common variety of crystalline quartz. Historically, it has been used for making stone tools when flint was unavailable. It appears white because the internal inclusions scatter light in all directions.

Field identification & locations

Identified in the field by its hardness (scratches glass), white color, and lack of cleavage. Often found as rounded pebbles in riverbeds or as veins in igneous and metamorphic rocks.