mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

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

Identified April 11, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from silica-rich hydrothermal solutions in veins or as a late-stage mineral in igneous pegmatites. It is found in geological environments ranging from ancient Precambrian shields to young volcanic systems.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as a landscape stone or decorative collector's item.

Geological facts

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

Field identification & locations

Identify in the field by its ability to scratch glass and its lack of cleavage. Look for a 'sugary' or vitreous texture and rounded edges if found in riverbeds (as a 'water-worn' pebble).