mineral

Pyrite (likely a small gold-bearing pyrite specimen)

Pyrite, iron disulfide (FeS₂)

AI-generated identification · may be incorrect

Brassy yellow metallic luster with granular, irregular crystal faces; Mohs hardness 6–6.5, cubic crystal system, indistinct cleavage, and specific gravity about 5.0. The pictured piece appears natural and uncut, though identification from the image is not definitive.

Identified September 13, 2026More mineral →

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At a glance

Common name: Pyrite (likely a small gold-bearing pyrite specimen)
Scientific name: Pyrite, iron disulfide (FeS₂)
Category: mineral
Identified: September 13, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a tiny common fragment; $10–$100+ for well-formed, lustrous crystals. If this is actually native gold, value could be substantially higher and requires assay.

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

Forms when iron and sulfur combine in low-oxygen hydrothermal veins, sedimentary rocks, and metamorphic settings; specimens range from Precambrian to modern geological formations. It commonly crystallizes in cubes, pyritohedra, or massive grains.

Uses & applications

Used historically as a sulfur and sulfuric-acid source, and occasionally for iron; attractive crystals are collected as “fool’s gold.” Gemstone use is limited because it is brittle and can tarnish or oxidize.

Geological facts

Pyrite’s bright metallic color resembles gold, but it is harder and less malleable. A streak test produces a greenish-black to brown-black streak, unlike gold’s yellow streak.

Field identification & locations

Common in sedimentary deposits, hydrothermal veins, coal beds, and metamorphic rocks worldwide, especially Spain, Peru, China, Italy, and the United States. Confirm with streak, hardness, density, and crystal form; gold requires professional testing.