@article{oai:ir.kagoshima-u.ac.jp:00012686,
 author = {小牧, 高志 and KOMAKI, Takashi},
 journal = {鹿児島大学工学部研究報告, The research reports of the Faculty of Engineering, Kagoshima University},
 month = {Sep},
 note = {Several studies have been reported on the silicious rock of the Yuojima. This report is studied on the Otanibira and the Kotake silicious rock and behavior of sulfer which coexist in there rock. The result of chemical analysis, thermal gravity, alkaline solubility test, X-ray diffraction and differential thermal analysis, these silicious rock are mainly composed amorphous silica, and a little of cristobalite, tridymite, quartz. The sulfer in the Otanibira rock is chiefly free sulfer, otherwise the sulfer in the Kotake rock is principally alunite.},
 pages = {75--80},
 title = {硫黄島産珪石の性状},
 volume = {13},
 year = {1971}
}