$Iron-stained quartz vein in a fine-grained host rock (Quartz (SiO₂) filling a fracture in an unidentified silicate rock; orange coloration likely from iron oxides/hydroxides) — metamorphic$

metamorphic

Iron-stained quartz vein in a fine-grained host rock

Quartz (SiO₂) filling a fracture in an unidentified silicate rock; orange coloration likely from iron oxides/hydroxides

AI-generated identification · may be incorrect

The specimen shows a translucent orange band in a tan-brown, fine-grained matrix. Quartz has Mohs hardness 7 and a vitreous luster; the host rock cannot be identified reliably from the photo.

Identified October 4, 2026More metamorphic →

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Physical properties

The specimen shows a translucent orange band in a tan-brown, fine-grained matrix. Quartz has Mohs hardness 7 and a vitreous luster; the host rock cannot be identified reliably from the photo.

Formation & geological history

Likely formed when silica-rich fluids filled a crack in the host rock, with iron compounds coloring the vein. The age and exact geological setting cannot be determined from the image.

Uses & applications

Small specimens are mainly collected for their contrasting vein and host; quartz is also widely used in glass, electronics, and decorative stone.

Geological facts

Iron oxides such as goethite or hematite can produce vivid yellow-orange staining in quartz veins.

Field identification & locations

Look for a distinctly harder, glassy vein cutting across a finer-grained matrix; a field hardness test and fresh surface would help confirm quartz and identify the host. Similar veins occur in many rock types worldwide.