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by Montana Public Radio
Field Notes from the Montana Natural History Center

Muscovite, The Glittering Ancient


Two-dimensional sheets of transparent muscovite, a mineral in the mica family that once formed in layers on the ocean floor, adorn the cliffs and peaks of the mountains and the rocks of the Bass Creek drainage. Iron-stained schist, a coarse-grained rock made of potassium feldspar and quartz, delightedly flaunted the sheets of muscovite on its orange surface, as if they were diamonds.



by Montana Public Radio