GALENA on PYRRHOTITE, ISSOM RL Renison Bell Tin Mine TASMANIA (small cabinet)

Galena, known as lead glance, is the natural mineral form of lead(II) sulfide (PbS) and serves as the primary ore for lead, as well as a significant source of silver. 

This mineral is among the most prevalent and widely found sulfide minerals, crystallizing in a cubic system and frequently exhibiting octahedral shapes. Galena is commonly found in association with other minerals such as sphalerite, calcite, and fluorite.

Pyrrhotite is a prevalent magnetic iron sulfide mineral (Fe₁₋ₓS) characterized by its bronze-brown hue, which often shows signs of tarnishing. This mineral serves as a significant source of nickel and has historical importance in iron production. However, it is infamous for its role in the deterioration of concrete and the cracking of foundations, particularly in regions like New England, where its oxidation leads to expansion. Commonly referred to as "magnetic pyrite," pyrrhotite exhibits a metallic luster, a grayish-black streak, and a hardness rating of 3.5 to 4. It can be found in igneous and metamorphic rocks, as well as in hydrothermal veins, frequently occurring alongside minerals such as pentlandite, pyrite, and chalcopyrite.