Yokohama Mineral World
http://www3.plala.or.jp/mineral-world/22-23 march 201320-22 july 2012Yokohama Trade Center Building, 1F < Marineria>
(trade center building, 1st floor probably)
2 Yamashitacho, Naka Ward, Yokohama, Tokyo, Japan
Mineralfesta
http://mineralfesta.info/13-15 december 2013
27-29 september 201321-23 september 2012Yokohama Red Brick Warehouse
Number 1 Kanagawa 1-1-1 Shinko, Naka-ku, Yokohama-shi, Tokyo, Japan
Also see
http://www.istone.org/etc/show.html