mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to orange/yellow due to iron oxide staining; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Milky white to orange/yellow due to iron oxide staining
Luster: Vitreous to waxy

Identified June 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes, crystallization from cooling magma, or precipitation from silica-rich fluids in rock cavities. This specimen likely comes from a hydrothermal vein.

Uses & applications

Used in the production of glass, ceramics, and electronics (as oscillators). Also used in jewelry (as semi-precious stones) and as decorative landscape materials.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Iron-stained quartz like this is often called 'ferruginous quartz'. It is extremely resistant to chemical weathering.

Field identification & locations

Identify in the field by its hardness (will scratch glass and steel), lack of cleavage, and translucent quality. Commonly found in riverbeds, mountain ranges, and within granite outcrops worldwide.