TrekGEO > Mineral Trail > Kanto region > Kanagawa pref. > Nanasawa

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Nanasawa, Atsugi city, Kanagawa pref., Japan


Low-temperature zeolite facies metamorphic rocks

Dacitic pumice tuff of middle Miocene Fudojiri Formation, Susugaya Subgroup, Tanzawa Group, subjected to Prehnite-Pumpellyite facies.


Outcrop of dacitic pumice tuff of Fudojiri Formation subjected to Prehnite-Pumpellyite faices metamorphism. The bluish-green pebbles are massive celadonite formed from dacite pebbles, and plagioclase crystals are included as residues. The surrounding dark gray matrix is tuff. This celadonite was treated as a semi-precious stone in ancient time, and is often found as necklaces in old burial mounds.

Reported Minerals

  • Celadonite

Mineral Assemblages

  • Celadonite - Plagioclase(Residue)
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