These minerals from Mexico are deceptively heavier than you would expect.
Galena is the natural mineral form of lead sulphide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulphide minerals. It crystallizes in the cubic crystal system often showing octahedral forms. It is often associated with the minerals sphalerite calcite and fluorite.
Each one measures 30mm by 30mm approximately, and you get one of these fabulous pieces (photo depicts natural variaton).