mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified July 5, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the cooling of silica-rich hydrothermal fluids in veins or as a primary constituent in igneous rocks. The milky color is caused by tiny fluid or gas inclusions trapped during crystallization.

Uses & applications

Used in glassmaking, as an abrasive, in electronics (quartz oscillators), as a decorative stone in landscaping, and in crystal healing practices.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is responsible for the white veins visible in many mountain ranges and is a common source of gold in hydrothermal deposits.

Field identification & locations

Identify in the field by its hardness (it scratches glass) and lack of cleavage. It is found globally, particularly in areas with metamorphic or igneous bedrock. Look for white, chunky rocks with a waxy surface in creek beds.