mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
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
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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.
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