mineral

Iron-stained quartz-rich rock, likely quartz vein material

Quartz (SiO₂), with iron-oxide staining and probable feldspar/matrix minerals

AI-generated identification · may be incorrect

Hardness about 7 for quartz; translucent white to gray with honey-yellow to brown coatings, vitreous luster, and irregular granular/fractured crystals. No obvious cleavage; iron oxides create the golden coloration. Exact identification is limited by the photograph.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich hydrothermal fluids filled fractures and crystallized as a quartz vein, later altered and stained by oxidizing iron-bearing groundwater. The age depends on its host geology and cannot be determined visually.

Uses & applications

Quartz specimens are collected and used as silica, glass, abrasives, and electronics materials; iron-stained pieces are mainly ornamental or educational. This rough specimen has modest value unless crystals, locality, or unusual mineral associations are confirmed.

Geological facts

The yellow-brown color is probably limonite/goethite rather than naturally yellow quartz (citrine). Associated gray material may be host rock or additional vein minerals.

Field identification & locations

Look for glassy fracture surfaces, scratch resistance against steel or glass, and lack of fizz with dilute acid; a hardness test and streak test can help distinguish quartz from calcite. Common in hydrothermal veins worldwide.