mineral

Iron-stained quartz crystal cluster

Quartz (SiO₂), likely iron-oxide-stained; exact variety uncertain

AI-generated identification · may be incorrect

Quartz has Mohs hardness 7, a vitreous luster, and a trigonal crystal structure; it lacks cleavage and breaks with conchoidal fracture. The specimen shows pale translucent quartz with rusty orange-brown staining, likely from iron oxides.

Identified September 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystals grow as silica-rich fluids cool in cavities or fractures; iron oxides can stain crystal surfaces or infiltrate cracks. Quartz forms in rocks of many ages, so the specimen’s age and precise origin cannot be determined from the image.

Uses & applications

Quartz is widely used in glass, electronics, and ornamental objects; attractive clusters are collected or displayed.

Geological facts

Quartz commonly forms six-sided prisms with pointed terminations, though this cluster’s crystal faces are irregular and partly obscured.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch glass, and no cleavage; iron staining alone does not establish a specific locality. Common worldwide in veins and cavities of igneous and metamorphic rocks.