mineral

Iron-stained quartz vein rock

Quartz (SiO₂), with iron-oxide minerals such as hematite and goethite

AI-generated identification · may be incorrect

Hardness about 7 for quartz; typically gray to white, brown, orange, and reddish, with a vitreous to dull luster. The specimen appears massive and granular rather than showing distinct crystals or cleavage; iron oxides provide the rusty coloration.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich hydrothermal fluids filled fractures, later weathered and oxidized near the surface. Its exact geological age cannot be determined from the photograph and depends on the host formation.

Uses & applications

Common quartz vein material is mainly a collector specimen; quartz is also important in glass, ceramics, abrasives, and electronics, while iron oxides are used as pigments and minor iron ore.

Geological facts

Quartz has no true cleavage and commonly breaks with curved, conchoidal fractures. A streak test on unglazed porcelain should be white for quartz, while reddish-brown streaks suggest abundant iron oxides.

Field identification & locations

Common in hydrothermal veins and mineralized zones worldwide, including quartz-rich mountain belts and old mining districts. A glass-scratch test, strong light-colored quartz grains, and rusty hematite/goethite coatings support identification.