R7: Petrology, Mineralogy and Economic geology (Joint Session with Society of Resource Geology)

[R7P-02] Amygdale minerals in the alkali basalt from Kabeshima Island, Saga Prefecture, SW Japan

[Presentation award entry]

*Satsuki Kio¹, Terumi Ejima¹ (1. Shinshu Univ. Sci)

Keywords:amygdale minerals, basalt, Kabeshima, cobalt

In this study, the amygdale minerals of alkali basalt from Kabeshima Island Saga Prefecture were described. The minerals were observed, and the chemical compositions were determined using a field emission electron probe micro analyzer. The amygdale minerals mainly consist of fine white-pale blue aggregate minerals, and rarely calcite, Fe-Ti oxide, Mn oxide, and dark blue mineral. The white-pale blue minerals have a spongy texture and are composed mainly of Mg, Al, and Si, and might be a type of clay mineral or zeolite. The dark blue mineral is porous and Co-bearing Mn-oxide.