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


High-temperature zeolite facies metamorphic rocks

Zeolite in siltstone formed by zeolite facies diagenesis in early Miocene Tomita Formation.


Outcrop of siltstone of Tomita Formation. Fissures of siltstone is filled with calcite and analcime. The dark gray host is siltstone. 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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