Abstract of Papers Presented at Annual Meeting of the Gemmological Society of Japan
2025 Annual Meeting
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Host: The Gemmological Society of Japan

Abstracts of Lectures at 2025 Annual Meeting of the Gemmological Society of Japan
Silica minerals occur from Northern part of Mt.Nantai, Nikko city, Tochigi Pref., East Japan
*Chihiro Fukuda, Shigenori Kawano, Yoshihide Nunokawa, Terumi Ejima
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Keywords: Opal, Silica minerals, Magma mixing, Volcanic rock, Nikko Volcanos
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Abstract

Silica minerals occurs in basalt – basaltic andesite lava, Nikko city, Tochigi prefecture. Most of geodes consist chalcedony, calcite, and zeolites. Some chalcedony geodes contain opal.

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© 2025 The Gemmological Society of Japan
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