Kanuma
Shimo-Ishikawa, Kanuma city, Tochigi pref., Japan
Occurrence
Sediments subjected to diagenesis
Weathered pumice of Late Pleistocene Ag-KP. Ag-KP distributes widely at the eastern side of Mount Akagi to the Pacific ocean, and its unique oragne color is a good key bed.
Outcrop of a pumice bed of Ag-KP. The pumice bed is composed of orange pumices approximately 5 mm in diameter. Note that wet pumices are orange but dry ones turn pale brown. This altered pumice, Kanuma-tsuchi, has been mined and sold as cultivation soil for Bonsai.
Reported Minerals
- Imogolite
- Allophane
Mineral Assemblages
- Imogolite - Allophane
Localities
- Kanuma (Weathered pumice, Imogilite)
- Bushi (Trace fossil, Siderite)
- Kowada (Nodule, Siderite)
- Nohori (Trace fossil, Vivianite)
Related Occurrences
- Albite-Epidote-hornfels facies
- Hornblende-hornfels facies
- Pyroxene-hornfels facies
- Sanidinite-hornfels facies