Orthoclase
Nose city, Toyono county, Osaka pref., Japan
Length of the upper crystal: 15 mm. Dispatched orthoclase crystals. The specimens have a dull luster as they were replaced by clay minerals.
Recovered from a dike of quartz porphyry intruded in tuff breccia of a caldera complex at the last stage of caldera formation. Formed in the Late Cretaceous (70 Ma).
Orthoclase from this location was described in 1951.