mineral

Quartz with Iron Stains

Silicon Dioxide (SiO2) with FeOx inclusions

Hardness: 7 (Mohs scale); Color: White, tan, with brown/orange stains; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: White, tan, with brown/orange stains
Luster: Vitreous to greasy

Identified June 8, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, tan, with brown/orange stains; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Formation & geological history

Formed in hydrothermal veins or as a secondary mineral in igneous and metamorphic rocks. The iron staining occurs when the specimen is exposed to groundwater containing iron oxides.

Uses & applications

Used in glass making, electronics, and as a decorative specimen. High-purity quartz is used in optical and precision instruments.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Iron-stained quartz like this is often called 'ferruginous quartz' or 'golden quartz'.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and translucent zones. Commonly found in veins around the world.

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