mineral

Iron-stained quartz

Quartz (SiO₂), likely colored by iron-oxide staining

AI-generated identification · may be incorrect

A rough, opaque-to-translucent yellow-orange and white specimen with a vitreous to dull luster and irregular fracture. Quartz has Mohs hardness 7 and a hexagonal crystal structure; it has no cleavage and specific gravity about 2.65.

Identified October 9, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich fluids in veins and cavities in many rock types. The rusty coloration can develop when iron-bearing minerals weather and stain the quartz; the specimen’s age and exact setting cannot be determined from the image.

Uses & applications

Common quartz is used in glassmaking, abrasives, and electronics; attractive pieces may be kept as inexpensive display or collection specimens.

Geological facts

Iron oxides such as goethite or hematite can produce yellow, orange, and brown coatings or inclusions in otherwise colorless quartz.

Field identification & locations

Look for hardness near 7, lack of cleavage, and a glassy surface or conchoidal fracture; iron staining alone does not establish a specific quartz variety. Quartz occurs worldwide, especially in veins and pegmatites.