mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

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

Hardness: 7 on the Mohs scale
Color: Opaque white to cream
Luster: Vitreous (glassy) to waxy

Identified July 20, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from silica-rich hydrothermal solutions or as veins in igneous and metamorphic rocks. This specific specimen has been water-worn into a smooth pebble shape over thousands of years in a river or beach environment.

Uses & applications

Commonly used as a decorative stone in landscaping, as an abrasive, in glassmaking, or as a pocket stone for collectors. High-purity quartz is used in electronics for its piezoelectric properties.

Geological facts

The milky white color is caused by tiny inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz found on Earth's surface.

Field identification & locations

To identify in the field, look for its ability to scratch glass and its lack of cleavage (it breaks like glass). It is found globally in gravel pits, riverbeds, and mountainous regions. It is an excellent indicator mineral for finding gold veins in certain geological settings.