mineral

Quartz pebble with iron stains

Macrocrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 Mohs; Color: Translucent white to tan with reddish-brown iron oxide surfaces; Luster: Vitreous to waxy; Structure: Hexagonal; Cleavage: None (conchoidal fracture).

Hardness: 7 Mohs
Luster: Vitreous to waxy

Identified July 20, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: Translucent white to tan with reddish-brown iron oxide surfaces; Luster: Vitreous to waxy; Structure: Hexagonal; Cleavage: None (conchoidal fracture).

Formation & geological history

Formed via hydrothermal activity or igneous crystallization. This specific piece is a water-rounded pebble likely weathered from a vein and tumbled in a river or coastal environment.

Uses & applications

Commonly used in landscaping, as a gemstone (if high quality), or industrial glass and electronics manufacturing (silica source).

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The reddish tint on this specimen is caused by thin films or inclusions of iron oxides like hematite or limonite.

Field identification & locations

Identified by its ability to scratch glass and lack of cleavage. Common in riverbeds and gravel pits worldwide. Collectors look for clearer terminations or unique inclusions.