galena - teaching student specimens of the primary ore of lead with attached matrix - Talsint (?) Morocco - Unit of 5 specimens chalcopyrite was oxidized by being

chalcopyrite was oxidized by being cooked in a solution of detergents containing perborate

Brown calcite is an interesting challenge to students who have been introduced to common white or light gray calcite

This is uniformly grain-sized

The Monastery Beach sand came down a creek

For the pink fluorescence

galena - teaching student specimens of the primary ore of lead with attached matrix - Talsint (?) Morocco - Unit of 5 specimens chalcopyrite was oxidized by beingGalena PbS Galena is a very common metallic sulfide. It often occurs in cubic crystals and has good cubic cleavage. It is practically the only source of lead, which is used in huge amounts in storage batteries and in shielding from radioactivity. Galena is the Latin name for lead ore. Galena is easily identified by students by its density, metallic luster and its cubic cleavage. Not cleaved into rectangular blocks, though they show cubic cleavage,