mineral

Quartz pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to waxy (weathered); Crystal structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous to waxy (weathered)

Identified May 29, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to waxy (weathered); Crystal structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Formation & geological history

Formed from the crystallization of silica-rich magma or through hydrothermal veins. This specific specimen is likely a water-worn or weathered fragment found in secondary deposits like riverbeds or glacial till. Quartz can date back billions of years depending on the host formation.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as a component in concrete and mortar. Highly translucent varieties are used in jewelry and lapidary arts.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to both chemical and physical weathering, which is why it often remains as pebbles after other minerals have eroded.

Field identification & locations

Identified in the field by its hardness (it can scratch glass), its lack of cleavage, and its characteristic conchoidal (shell-like) fracture. Found globally in almost all geological environments.