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Labradorite: (Ca,Na)(Si,Al)4O8 Plagioclase: (Na,Ca)(Si,Al)4O8
Comments: Dual view of a cleavage fragment of labradorite showing the multi-colored labradorescence (schiller effect) and the same area viewed without the color. The color is due to optical interference on Bøggild exsolution lamellae. Location: Ihosy, Betroka district, Toliara Province, Madagascar. Scale: Picture size 3x3 cm. © Dave Barthelmy