mineral

Gold-colored mineral specimen, likely pyrite or weathered mica schist

Tentatively pyrite (FeS₂); identification is uncertain from the obscured image

AI-generated identification · may be incorrect

Brassy yellow color and metallic-looking luster suggest pyrite, Mohs hardness 6–6.5, cubic crystal structure, and poor cleavage. If flaky and easily split into sheets, it may instead be biotite mica in schist; mica has Mohs hardness 2.5–3 and perfect basal cleavage.

Identified August 14, 2026More mineral →

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At a glance

Common name: Gold-colored mineral specimen, likely pyrite or weathered mica schist
Scientific name: Tentatively pyrite (FeS₂); identification is uncertain from the obscured image
Category: mineral
Identified: August 14, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common specimen; $50–$300+ for large, sharply crystallized pyrite or attractive mica specimens.

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

Pyrite forms in hydrothermal veins and sedimentary or metamorphic rocks; mica schist forms when clay-rich sediments undergo regional metamorphism. Ages vary widely by locality, commonly Precambrian to younger.

Uses & applications

Pyrite is collected and historically mined for sulfur and minor metals; mica is used in electrical insulation, fillers, and cosmetics. Neither is typically used as a gemstone except in decorative specimens.

Geological facts

Pyrite is commonly called “fool’s gold,” but it is harder and more brittle than true gold. Gold is malleable and leaves a yellow streak, whereas pyrite produces a dark greenish-black streak.

Field identification & locations

Test streak on unglazed porcelain, hardness, brittleness, and crystal shape; avoid relying on color alone. Common localities include Peru, Spain, Italy, China, and the United States.