mineral

Quartz Pebble

Silicon dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Cloudy white to opaque with iron oxide staining; Luster: Vitreous to waxy (when weathered); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Cloudy white to opaque with iron oxide staining
Luster: Vitreous to waxy (when weathered)

Identified July 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes or as a primary constituent of igneous rocks. This specific specimen shows signs of water-wear or weathering into a rounded, sub-angular pebble shape.

Uses & applications

Common quartz is used in construction as aggregate, in glass manufacturing, and as abrasive material. Polished varieties are used in decorative gravel or aquarium substrate.

Geological facts

Quartz is one of the most abundant minerals in Earth's crust. The slight orange or brownish stains on this specimen are likely due to iron oxide impurities or inclusions.

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and lack of cleavage. Look for it in riverbeds, glacial tills, and mountainous regions worldwide.