mineral

Quartz-rich hydrothermal vein specimen, possibly iron-stained quartz with calcite

Quartz (SiO₂), with probable calcite (CaCO₃) and iron-oxide staining

AI-generated identification · may be incorrect

White to translucent, coarse crystalline masses with sugary to glassy luster and yellow-brown staining; quartz hardness 7, calcite hardness 3, with irregular fracture and no obvious cleavage. The image is insufficient to confirm individual mineral grains or specific gravity.

Identified September 8, 2026More mineral →

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At a glance

Common name: Quartz-rich hydrothermal vein specimen, possibly iron-stained quartz with calcite
Scientific name: Quartz (SiO₂), with probable calcite (CaCO₃) and iron-oxide staining
Category: mineral
Identified: September 8, 2026
Method: Standard

AI Estimated Value

About $5–$40 for a common hand specimen; roughly $50–$200 if unusually attractive, locality-documented, or proven to contain gold.

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- and carbonate-rich hydrothermal fluids filled a fracture, later oxidizing to produce yellow-brown iron staining. The geological age cannot be determined from appearance alone; such veins occur in rocks of many ages.

Uses & applications

Quartz vein material is mainly a collector specimen and may be crushed for silica; calcite has industrial uses in cement, lime, aggregate, and fillers. Visible gold is not established by this photograph, despite the yellow coloration.

Geological facts

The yellow areas may be limonite/goethite, altered sulfides, or cream-colored calcite rather than gold. A streak, hardness, acid, and specific-gravity test would help distinguish them.

Field identification & locations

Common in hydrothermal districts worldwide, including quartz-vein regions of North America, South America, Australia, and Europe. Scratch suspected quartz with steel only cautiously; calcite effervesces in dilute hydrochloric acid, while gold does not tarnish or crumble.