mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness of 7 on the Mohs scale, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, and white to translucent appearance with yellow-brown iron oxide (hematite/goethite) surface staining.

Identified July 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms in a wide variety of geological environments, including hydrothermal veins, pegmatites, and as a primary mineral in igneous and metamorphic rocks. Iron staining occurs from weathering and groundwater containing dissolved iron.

Uses & applications

Used widely as a decorative mineral specimen, in lapidary work, landscape stone, and historically as an industrial abrasive and silica source.

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust. Iron oxide surface coatings often give white or milky quartz a distinct orange, yellow, or rusty reddish hue.

Field identification & locations

Can be identified by its ability to scratch glass (Mohs 7), lack of cleavage, and characteristic greasy to glass-like luster. Extremely common worldwide in riverbeds, mountains, and gravel pits.