mineral

Iron-stained quartz, possibly smoky quartz

Quartz (SiO₂), with reddish-brown iron-oxide staining; exact variety is uncertain from the photo

AI-generated identification · may be incorrect

Mohs hardness 7; translucent to opaque, glassy luster, irregular fracture, and no cleavage. The gray-brown and rusty-red colors may reflect inclusions or surface iron oxides; quartz has a hexagonal crystal structure, though no clear crystal form is visible here.

Identified September 30, 2026More mineral →

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At a glance

Common name: Iron-stained quartz, possibly smoky quartz
Scientific name: Quartz (SiO₂), with reddish-brown iron-oxide staining; exact variety is uncertain from the photo
Category: mineral
Identified: September 30, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 for a common small rough fragment; value depends on confirmed identity, size, and specimen quality.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich fluids in veins and cavities, or occurs in igneous and metamorphic rocks. Its geological age and specific formation setting cannot be determined from the image.

Uses & applications

Quartz is used in glass, electronics, abrasives, and construction; attractive pieces may be kept as mineral specimens, though this rough fragment appears modest in display quality.

Geological facts

Quartz is one of Earth’s most abundant minerals and can show many colors from impurities and inclusions.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch ordinary glass, and lack of cleavage; reddish staining alone does not establish a distinct quartz variety. Quartz occurs worldwide in veins, pegmatites, and many rock types.