mineral

Iron-stained quartz crystal cluster

Quartz (SiO₂), likely stained by iron oxides

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent to clear with yellow-brown staining and a vitreous luster. Hexagonal prismatic crystals with pointed terminations; quartz has no cleavage and conchoidal fracture.

Identified September 26, 2026More mineral →

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Physical properties

Hardness 7 Mohs; translucent to clear with yellow-brown staining and a vitreous luster. Hexagonal prismatic crystals with pointed terminations; quartz has no cleavage and conchoidal fracture.

Formation & geological history

Quartz crystallized from silica-rich fluids in a cavity or vein, with later iron-oxide staining. Quartz occurs in rocks of many ages; the specimen’s age and exact formation setting cannot be determined from the image.

Uses & applications

Quartz is used in glass, electronics, and industrial abrasives; attractive clusters are collected and used decoratively.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly forms six-sided prisms.

Field identification & locations

Look for glassy, hard crystals with hexagonal prisms and pointed ends; iron staining produces yellow or rusty patches. Found worldwide in veins, geodes, and pegmatites; the image does not establish a specific locality.