mineral

Iron-stained quartz with reddish iron-oxide coating

Quartz (SiO₂), likely colored by hematite (Fe₂O₃) and/or goethite (FeO(OH))

AI-generated identification · may be incorrect

Quartz is Mohs 7, vitreous to dull, and has hexagonal crystals without cleavage; the rusty red-brown coloration is likely iron-oxide staining. The image does not show enough detail to confirm a specific iron mineral or crystal habit.

Identified October 13, 2026More mineral →

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Physical properties

Formation & geological history

Likely quartz formed in a vein or cavity from silica-rich fluids, later stained by iron-bearing fluids or weathering. The specimen’s age and exact geological setting cannot be determined from the image.

Uses & applications

Quartz is used in glass, electronics, and decorative stone; attractive pieces are collected or used in lapidary work.

Geological facts

Iron oxides can coat or permeate quartz, producing red, orange, or brown colors without changing quartz’s basic composition.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch glass, and no obvious cleavage; iron staining commonly occurs in oxidized veins and weathered rocks. More precise identification requires close examination or testing.