metamorphic

Iron-oxide-stained quartz-rich rock (possibly quartz vein material)

Likely quartz (SiO₂) with iron-oxide/hydroxide staining; exact rock type cannot be determined from the image alone

AI-generated identification · may be incorrect

Gray-brown, rough and opaque, with an irregular pale quartz-like vein; likely quartz hardness 7 Mohs, vitreous to dull luster, trigonal crystal structure, and no cleavage. The darker host material is not identifiable visually.

Identified September 25, 2026More metamorphic →

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Physical properties

Formation & geological history

May be quartz deposited in a fracture and later stained by iron oxides; its age and whether the host is metamorphic or another rock type cannot be established from the image.

Uses & applications

Quartz-rich material is used in glass, ceramics, and construction aggregate; this specimen appears mainly suitable for general collecting.

Geological facts

The pale band resembles a quartz vein, formed when silica-bearing fluids fill cracks and crystallize; iron-bearing fluids can produce rusty brown staining.

Field identification & locations

Look for hardness (quartz scratches glass), lack of cleavage, and a glassy fracture on fresh surfaces; quartz veins occur in many rock types worldwide. Approximate value: $1–$15 for a small common specimen.