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Nomaki, Minano city, Chichibu county, Saitama pref., Japan


High-temperature zeolite facies metamorphic rocks

Zeolite in mudstone formed by zeolite facies diagenesis in Tomita Mudstone Member of early Miocene (16 Ma) Oganomachi Formation.


Outcrop of mudstone of Oganomachi Formation. Fissures of mudstone is filled with calcite and analcime. The dark gray host is mudstone. The dark brown veins are composed of calcite and analcime. Euhedral crystals of analcime are observed in the open spaces where calcite is dissolved by weathering.

Reported Minerals

  • Analcime
  • Calcite

Mineral Assemblages

  • Analcime - Calcite
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