mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: White to off-white/cream; Luster: Vitreous to waxy when water-worn; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to off-white/cream
Luster: Vitreous to waxy when water-worn

Identified May 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal veins or within igneous and metamorphic rocks. This specific specimen is a water-worn river or beach pebble, shaped by thousands of years of mechanical erosion.

Uses & applications

Used fundamentally in glass making, electronics (piezoelectric properties), and as decorative landscaping gravel or tumbled stones.

Geological facts

Milky quartz gets its cloudy white appearance from tiny fluid inclusions of gas or liquid trapped during crystal growth. It is the most common variety of crystalline quartz on Earth.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and white color. It is found globally in riverbeds, beaches, and mountain trails.