Muscovite
Hirukawa
Hirukawa, Nakatsugawa city, Gifu pref., Japan
Width of the crystal: 20 mm. A hexagonal crystal of muscovite. The hexagonal tabular silver-white crystal is muscovite. The micaceous pale yellow crystals on the surface are also muscovite. The massive translucent white part is quartz. The triangle face at the right end is a pyramidal face of quartz crystal.
Recovered from a pocket of a Topaz-NYF pegmatite associated with S-type (Ilmenite-series) granite. Formed in the Late Cretaceous (67 Ma).
Muscovite from this location was described in 1895.