mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 Mohs; Color: Opaque white to cream with yellowish iron staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture).

Hardness: 7 Mohs
Color: Opaque white to cream with yellowish iron staining
Luster: Vitreous to greasy

Identified July 13, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: Opaque white to cream with yellowish iron staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture).

Formation & geological history

Formed from silica-rich hydrothermal fluids or within igneous pegmatites. This specific specimen has been Rounded and smoothed by water action in a river or beach environment.

Uses & applications

Used as an abrasive, in glass making, as architectural gravel, and by beginner collectors for tumbling and lapidary practice.

Geological facts

Quartz is one of the most abundant minerals in Earth's crust. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Field identification & locations

Commonly found in riverbeds, glacial deposits, and beaches worldwide. Identify by its ability to scratch glass, its lack of cleavage, and its waxy/greasy luster when wet.