mineral

Quartz with Iron Oxide Inclusions

Silicon Dioxide (SiO2) with Iron Hydroxide/Oxide (Limonite/Goethite)

AI-generated identification · may be incorrect

Hardness: 7 on the Mohs scale. Color: White to translucent quartz with yellowish-brown to orange limonite/iron staining. Luster: Vitreous to greasy. Crystal System: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture).

Hardness: 7 on the Mohs scale
Luster: Vitreous to greasy

Identified July 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where silica-rich fluids precipitated quartz in rock fractures or cavities, later stained or encrusted with secondary iron minerals formed by oxidation and weathering.

Uses & applications

Mainly collected as a mineral specimen, lapidary rough, or for educational study. Clean, high-grade quartz is used in electronics, optics, and glassmaking.

Geological facts

Iron oxide coatings give quartz specimens a rusty, golden, or earthy appearance. Collectors often use oxalic acid baths to strip the iron oxide away and reveal pristine white or clear quartz underneath.

Field identification & locations

Identify in the field by checking for quartz hardness (scratches glass readily) combined with distinct rusty orange-brown staining in cavities and seams. Commonly found in quartz veins and hydrothermal mineral deposits worldwide.