mineral

Milky Quartz Pebble with Iron Inclusions

Crystalline Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Milky white to translucent with dark reddish-brown inclusions; Luster: Vitreous to greasy; Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture.

Hardness: 7 on Mohs scale
Luster: Vitreous to greasy

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent with dark reddish-brown inclusions; Luster: Vitreous to greasy; Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture.

Formation & geological history

Formed from hydrothermal veins or as a primary constituent in igneous rocks like granite. This specimen appears water-worn, smoothed by wave or river action most likely during the Quaternary period.

Uses & applications

Primarily used as a decorative collectible or abrasive. Pure quartz is used in glassmaking and electronics (piezoelectricity).

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The milky color is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth.

Field identification & locations

Identifiable by its inability to be scratched by a steel knife and its lack of cleavage. Commonly found on beaches and in riverbeds globally due to its high resistance to chemical and physical weathering.