Tučekite, Tucekite
Kami-Kasuo, Kanuma city, Tochigi pref., Japan
Field of view: 10 mm. Tučekite (Tucekite) associated with calcite. The yellow to dark gray prisms with a metallic luster are Tučekite (Tucekite). The white basement is calcite encrusted with a brown limonite crust.
Recovered from a chert-hosted bedded manganese deposit subjected to Hornblende-hornfels facies contact metamorphism by S-type (Ilmenite-series) granodiorite. Formed in the early Paleocene (64 Ma).
Tučekite (Tucekite) from this location was described in 2008.