Galena is a common and popular mineral for rock hounds.
Its characteristic cubes, distinctive cleavage and high
density make it easy to identify and a favorite in high
school geology labs. The structure of Galena is identical
to that of halite, NaCl. The two minerals have the same
crystal shapes, symmetry and cleavage. Some Galena may
contain up to 1% silver in place of lead. The large
volume of Galena that is processed for lead produces
enough Silver as a by product to make Galena the leading
ore of Silver.