mineral

Polished quartz vein in iron-stained host rock

Quartz (SiO₂), likely with limonite/goethite and possible feldspathic or chalcedonic matrix

AI-generated identification · may be incorrect

Hardness ~7 for quartz; cream-white to translucent with rusty yellow-brown iron staining, vitreous to earthy luster, and granular/massive crystal structure. Irregular fractures and porous cavities are visible; cleavage is absent in quartz.

Identified September 10, 2026More mineral →

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At a glance

Common name: Polished quartz vein in iron-stained host rock
Scientific name: Quartz (SiO₂), likely with limonite/goethite and possible feldspathic or chalcedonic matrix
Category: mineral
Identified: September 10, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a small common polished specimen; roughly $30–$100+ if unusually attractive, large, 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 hydrothermal fluids filled fractures in older host rock, with later oxidation producing limonite/goethite staining. The exact geological age and locality cannot be determined from the photograph.

Uses & applications

Primarily a lapidary and collector specimen; quartz is also used in glass, ceramics, abrasives, and electronics. The attractive polished contrast may have modest jewelry or ornamental value.

Geological facts

The metallic-looking golden areas are probably iron oxides rather than native gold; a streak, hardness, and specific-gravity test would help distinguish them. The white translucent material resembles quartz or chalcedony.

Field identification & locations

Look for glassy translucency, conchoidal fracture, and resistance to a steel file; iron oxides typically have an ochre-brown streak and earthy texture. Common in hydrothermal veins, weathered mineralized zones, and placer gravels.