mineral

Metallic sulfide ore specimen

Likely pyrite-bearing massive sulfide, possibly pyrrhotite or galena; exact identification requires testing

AI-generated identification · may be incorrect

Dark gray to brassy metallic surface, irregular massive texture, cavities, and uneven fracture; likely Mohs 3–6 depending on mineral. No reliable crystal form is visible; streak, hardness, magnetism, and specific gravity would distinguish candidates.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed by hydrothermal or volcanic massive-sulfide processes, where sulfur-rich fluids deposited iron-, lead-, or copper sulfides; age is indeterminate from the image.

Uses & applications

Collected as an ore specimen and sometimes used for teaching; sulfide minerals may be sources of iron, lead, copper, or sulfur, but this piece is not suitable for jewelry or construction.

Geological facts

Pyrite is iron disulfide (FeS₂), pyrrhotite is commonly magnetic iron sulfide (Fe₁₋ₓS), and galena is lead sulfide (PbS). Weathered sulfides can produce acidic runoff and may contain toxic metals.

Field identification & locations

Look for a metallic luster, heavy weight, and possible magnetism; pyrite commonly has a greenish-black streak, galena a dark gray streak, and pyrrhotite is often magnetic. Common settings include mine dumps and sulfide ore deposits worldwide.