mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Pinkish-orange to reddish-brown (conchoidal fracture); Luster: Vitreous/glassy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None

Hardness: 7 on Mohs scale
Color: Pinkish-orange to reddish-brown (conchoidal fracture)
Luster: Vitreous/glassy

Identified June 21, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Pinkish-orange to reddish-brown (conchoidal fracture); Luster: Vitreous/glassy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None

Formation & geological history

Formed in hydrothermal veins or pegmatites; the orange/red hue comes from hematite or limonite (iron oxide) inclusions or surface staining. It can be found in rocks from nearly all geological periods.

Uses & applications

Used as an abrasive, in glassmaking, as a gemstone (semi-precious), and in electronics for its piezoelectric properties. This specific rough form is often used in landscaping or for lapidary tumbling.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Iron-stained quartz is sometimes mistakenly called 'River Gold' or 'Ferruginous Quartz' depending on the intensity of the color.

Field identification & locations

Identify by its ability to scratch glass, lack of cleavage, and translucent waxy appearance. Commonly found in riverbeds, mountains, and as a component in granite and gneiss worldwide.