mineral
Galena
Galena (lead sulfide, PbS), possibly a galena-rich ore specimen
AI-generated identification · may be incorrectTypically lead-gray to silver-gray with metallic luster, cubic crystal structure, and perfect cubic cleavage; Mohs hardness 2.5–3, density about 7.4–7.6 g/cm³. The specimen’s bright metallic gray, heavy-looking, granular appearance is consistent with galena, though the image is not diagnostic.
Identified More mineral →
Explore Galena in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Typically lead-gray to silver-gray with metallic luster, cubic crystal structure, and perfect cubic cleavage; Mohs hardness 2.5–3, density about 7.4–7.6 g/cm³. The specimen’s bright metallic gray, heavy-looking, granular appearance is consistent with galena, though the image is not diagnostic.
Formation & geological history
Forms mainly in hydrothermal veins and replacement deposits, commonly with sphalerite, pyrite, quartz, or calcite. Deposits range from Precambrian to Cenozoic ages.
Uses & applications
Primary ore of lead and an important historical source of silver; used in batteries, radiation shielding, and specialized alloys. Attractive crystals are collected but not generally used as gemstones.
Geological facts
Galena’s cubic cleavage and unusually high density are distinctive; freshly broken surfaces may tarnish quickly. Lead-bearing specimens are toxic if dust is inhaled or residue is ingested.
Field identification & locations
Check for very high heft, cubic cleavage, and a dark gray streak; do not lick or grind it. Common localities include Missouri, Illinois, Colorado, Peru, Mexico, Australia, and the United Kingdom.
