mineral

Quartz-bearing geode or vuggy quartz specimen

Quartz, silicon dioxide (SiO₂), possibly with chalcedony and iron-oxide staining

AI-generated identification · may be incorrect

Typically hardness 7 Mohs, vitreous to sugary luster, white to translucent crystals, conchoidal fracture, and no cleavage; the brown-orange colors likely reflect iron oxides. The irregular cavity and drusy crystal coating are characteristic of a geode or mineral vug.

Identified August 25, 2026More mineral →

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At a glance

Common name: Quartz-bearing geode or vuggy quartz specimen
Scientific name: Quartz, silicon dioxide (SiO₂), possibly with chalcedony and iron-oxide staining
Category: mineral
Identified: August 25, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a small ordinary specimen; $30–$100+ if crystals are unusually bright, well formed, or from a documented locality.

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 when silica-rich groundwater filled cavities in volcanic rock or deposited minerals in fractures; quartz commonly formed from hydrothermal or low-temperature fluids over millions of years. The exact age and host rock cannot be determined from the photograph.

Uses & applications

Used as a collector specimen, ornament, and occasionally as lapidary material; quartz is also important industrially in glass, electronics, and abrasives.

Geological facts

The sparkling surface appears to be drusy quartz—many tiny intergrown crystals rather than a single crystal. Color alone does not establish a gemstone variety.

Field identification & locations

Identify by its glassy sparkle, hardness, lack of cleavage, and inability to scratch it with a steel knife; acid testing and microscopy could distinguish calcite or chalcedony admixture. Common sources include Brazil, Uruguay, Mexico, Morocco, and U.S. volcanic regions.