mineral

Iron-stained quartz cluster

Quartz (SiO₂), likely with limonite/goethite staining and possible feldspar matrix

AI-generated identification · may be incorrect

Hardness ~7 Mohs; translucent honey-orange to clear crystals, vitreous luster, irregular crystal cluster, and no obvious cleavage. The orange-brown color is likely iron-oxide coating or inclusions rather than intrinsic quartz color.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallized from silica-rich hydrothermal fluids in fractures or cavities, with later oxidation producing limonite/goethite staining. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used mainly as a decorative or collector specimen; quartz is also important in glass, ceramics, electronics, and abrasives. Attractive crystal clusters may be displayed or polished, but this piece appears primarily suited for collecting.

Geological facts

The specimen resembles iron-stained quartz or honey quartz, not confidently identifiable as citrine from appearance alone; natural citrine is relatively uncommon compared with heat-treated amethyst.

Field identification & locations

Look for glassy luster, conchoidal fracture, lack of cleavage, and inability to scratch it with a steel knife; quartz scratches glass. Common sources include Brazil, Madagascar, the United States, and worldwide hydrothermal veins.