Rare Mineral Specimen Fluorite & Galena from Mexico

This specimen has equal parts Fluorite & Galena. The sparkling clear fluorite has some interesting crystal formation as does the galena. The crystal structure of Fluorite and galena is always cubic, however the cubes are stacked in a linear form. Which makes these Fluorite and galena appear to be making octahedrons. This is a nice old specimen from Naica Mexico.