mineral

Iron-stained Quartz Pebble

Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)

Hardness: 7 on Mohs scale; Color: Yellowish-orange to rusty brown due to iron staining; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Yellowish-orange to rusty brown due to iron staining
Luster: Vitreous to waxy

Identified July 17, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in various geological environments, commonly in hydrothermal veins or as a component of igneous rocks. This specific specimen has been weathered and rounded by water transport and stained by iron-rich groundwater.

Uses & applications

Commonly used in landscaping as decorative gravel, in construction, and as a semi-precious material for amateur lapidary (tumbling and polishing).

Geological facts

Iron staining is a superficial or internal coloration caused by the oxidation of iron minerals. This pebble is essentially a common variety of 'rusty' quartz or Citrine-like material found in riverbeds.

Field identification & locations

Identified by its hardness (scratches glass), lack of cleavage, and translucent to opaque orange-brown color. Found globally in riverbeds, glacial tills, and beaches.

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