mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent cream; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent cream
Luster: Vitreous to waxy

Identified May 3, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent cream; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal solutions or as a primary constituent in igneous and metamorphic rocks. This specific specimen has been ocean-tumbled or river-worn into a smooth, rounded shape.

Uses & applications

Used in glassmaking, abrasives, construction aggregates, and as decorative stone or landscaping mulch. Higher quality specimens are used for lapidary work and beads.

Geological facts

Quartz is one of the most abundant minerals on Earth. The milky color is caused by microscopic inclusions of gas or liquid that were trapped during the crystal's formation.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and smooth, rounded appearance when found on beaches. Very common in glacial till and coastal regions.