mineral

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, vitreous to greasy luster, translucent to opaque, white or colorless when pure but showing yellow, orange, or reddish hues due to iron oxide staining, conchoidal fracture with no true cleavage, hexagonal crystal system.

Identified August 1, 2026More mineral →

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Physical properties

Formation & geological history

Forms in a wide variety of geological environments, most commonly crystallized from silica-rich hydrothermal veins, pegmatites, and igneous rocks like granite, as well as accumulating in sedimentary deposits due to extreme resistance to weathering.

Uses & applications

Used widely in glassmaking, electronics, oscillators, abrasives, gemstones, and ornamental carvings.

Geological facts

Quartz is one of the most abundant and widely distributed minerals found on Earth's continental crust. Iron staining, often referred to as hematite or limonite coating, gives specimens like this warm, golden-orange appearance.

Field identification & locations

Easily identified by its high hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found globally in almost every geological setting.