mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 Mohs; Color: White to creamy white; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 Mohs
Color: White to creamy white
Luster: Vitreous to greasy

Identified July 10, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: White to creamy white; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids or within pegmatites. The milky color is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth. This specimen appears water-worn or tumbled.

Uses & applications

Used in glass manufacturing, as an abrasive, in landscaping, as a source of silicon for electronics, and in decorative jewelry or crystal healing collections.

Geological facts

Milky quartz is the most common variety of crystalline quartz. While it lacks the transparency of rock crystal, it is chemically the same. It is often found in massive veins that can be several meters thick.

Field identification & locations

Identify by its ability to scratch glass (hardness 7), its lack of cleavage, and its opaque white 'cloudy' appearance. It is found globally in almost any geological environment, particularly in riverbeds and on beaches.