mineral

Likely raw metallic sulfide mineral, possibly galena or sphalerite

Uncertain; galena (PbS) or sphalerite (ZnS) are plausible

AI-generated identification · may be incorrect

Small dark gray-black, irregular crystalline specimen with metallic to resinous luster. Hardness is likely Mohs 2.5–4 (galena) or 3.5–4 (sphalerite); cleavage and streak cannot be confirmed from the image.

Identified September 8, 2026More mineral →

Explore Likely raw metallic sulfide mineral, possibly galena or sphalerite in the encyclopedia →

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Physical properties

Formation & geological history

Most likely formed in hydrothermal veins or replacement deposits, commonly with quartz, calcite, and other sulfides; specimens may range from young to Precambrian depending on locality.

Uses & applications

Galena is an important lead ore and historical source of silver; sphalerite is the chief zinc ore. Attractive crystals are collected, but neither is generally used as jewelry because of softness and toxicity concerns.

Geological facts

The metallic appearance and blocky, uneven form suggest a sulfide rather than an ordinary rock, but the photograph is insufficient for confident identification.

Field identification & locations

Check streak, cleavage, density, and crystal form: galena has a dark gray streak, cubic cleavage, and very high density (~7.5); sphalerite commonly has a pale streak, resinous luster, and lower density (~4). Avoid dust or prolonged handling until identified.