Galena
ID: 15
Galena
Chemical Formula
PbS
Hardness (Mohs)
2.5 - 2.75
Crystal System
Isometric
Streak
Lead-gray to grayish black
Luster
Metallic
Diaphaneity
Opaque
Color
Lead-gray, dark lead-gray
Crystal Habit / Mode of Occurrence
Isometric - Hexoctahedral; commonly cubic, cubo-octahedral, or octahedral; also cleavable masses, granular.
Fun Facts
Galena's crystal structure is identical to that of halite, which explains its perfect cubic cleavage. Common Uses: Primary ore of lead (used in batteries, ammunition, radiation shielding), historical use in radio detectors ("cat's whisker" radios).