mineral

Iron-stained quartz vein

Quartz (SiO₂) with iron-oxide/hydroxide staining, likely limonite/goethite

AI-generated identification · may be incorrect

Translucent to milky white and honey-brown, with a glassy luster and irregular fracture; quartz has Mohs hardness 7 and a trigonal crystal structure, with no cleavage. The rusty coating is softer and may leave an ochre streak.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich hydrothermal fluids in fractures, often in ancient igneous or metamorphic terranes; iron staining formed later through oxidation and weathering. Exact age and locality cannot be determined from the image.

Uses & applications

Quartz is used in glass, electronics, and ornamental stone; this rough iron-stained specimen is mainly suitable for collecting or lapidary display.

Geological facts

The brown-yellow color is likely iron oxides rather than the quartz itself; quartz does not react with dilute acid and can scratch ordinary glass.

Field identification & locations

Look for glassy translucent areas, hardness near 7, and uneven fracture without cleavage; common worldwide in quartz veins and weathered outcrops. A photo alone cannot confirm the iron minerals or locality.