Hübnerite and Quartz minor dusting of Pyrite! Specimen shows deep red internal reflections when backlit. Huayllapon Mine, Peru
Moonstone - Sri Lanka / moonstone consists of albite, alternating with layers of either Orthoclase or Sanidine. The layering interferes with the light entering the stone, resulting in a shifting blue glow known as adularescence (after the gem's original name: "adularia").