mineral

Quartz pebble with iron inclusions

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Grayish-white to clear with orange-red staining (iron oxides); Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture)

Hardness: 7 on Mohs scale
Luster: Vitreous to waxy

Identified July 11, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Grayish-white to clear with orange-red staining (iron oxides); Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture)

Formation & geological history

Forms in hydrothermal veins or as a primary constituent in igneous rocks like granite. This specific specimen appears to be a water-worn or weathered pebble containing secondary iron oxide staining from groundwater or oxidation.

Uses & applications

Commonly used as an abrasive, in glassmaking, electronics (piezoelectric properties), and widely as a decorative stone or for jewelry when high quality.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Iron-stained quartz like this is often referred to as 'ferruginous quartz' or 'limonitic quartz'.

Field identification & locations

Identified in the field by its hardness (it will scratch glass), lack of cleavage, and common occurrence in gravel beds, riverbanks, and mountainous terrain worldwide.