211108_private-collection_DSC00497_Lr_fuji-motosuko-scoria

Basaltic scoria from Lake Motosuko, Fujikawaguchiko-machi, Minamitsuru-gun, Yamanashi, private collection, 2021 by Katsuaki Watanabe

玄武岩質スコリア（山梨県南都留郡富士河口湖町本栖湖産、個人蔵）