NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Muscovite, a variety of mica, is a silicate mineral of aluminium and potassium. It is found in metamorphic rocks, like gneiss, and plutonic rocks (igneous rocks that solidify slowly under high pressure deep in the Earth's crust), like granite. It gives such rocks a slight sparkle. This specimen has hematite and limonite inclusions. It is from Adelaide, Australia.
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