mineral

Iron-stained quartz-rich rock, possibly smoky quartz

Quartz (SiO₂), likely with iron-oxide staining and dark inclusions; exact identification is uncertain from the photo

AI-generated identification · may be incorrect

Hardness 7 Mohs; brown to gray, translucent in places, with a vitreous luster and irregular fracture. The apparent granular texture may indicate quartz in a matrix rather than a single crystal; no clear cleavage is visible.

Identified September 16, 2026More mineral →

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At a glance

Common name: Iron-stained quartz-rich rock, possibly smoky quartz
Scientific name: Quartz (SiO₂), likely with iron-oxide staining and dark inclusions; exact identification is uncertain from the photo
Category: mineral
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 for a small, ordinary rough specimen; more if locality, crystals, or unusual inclusions are confirmed.

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

Likely formed in a hydrothermal vein or pegmatitic environment, where silica-rich fluids deposited quartz and later oxidation produced reddish-brown iron staining. A precise geological age cannot be determined visually.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and countertops; attractive pieces may be sold as mineral specimens. This specimen appears more suitable for casual collecting than jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. The dark material could be inclusions or attached host rock, not necessarily smoky quartz.

Field identification & locations

Look for glassy luster, conchoidal fracture, lack of cleavage, and resistance to scratching with a steel blade; quartz should scratch glass. Common worldwide, especially in hydrothermal veins and pegmatites.