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Rocks and Minerals seen through the Petrological Microscope
(Scale: Each image approx. 0.75 mm across)
Granite with Garnet and Biotite Mica. Locality unknown.Garnet at top, Feldspar and Quartz lower right, Biotite mostly lower left with radiation caused dark, circular pleochroic haloes. Long bright crystal is Muscovite Mica.