Chemical Education Journal (CEJ), Vol. 5, No. 1 /Registration No. 5-2/Received May 24, 2001.
URL = http://www.juen.ac.jp/scien/cssj/cejrnlE.html



CHALCEDONY

Name: chalcedony
Occurs in: Morai seaside, Atsuta-mura, Hokkaido, Japan
Width of Picture: about 1.2 mm
Chemical Formula: SiO2

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Takanobu Oba
Geoscience Department, Joetsu University of Education
E-Mail:ohba@juen.ac.jp
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