R4: Mineral sciences of the Earth surface

3:45 PM - 4:00 PM JST(6:45 AM - 7:00 AM UTC)

[R4-08] Mineralogical study of manganese-rich tissue in radular teeth of chitons

*Koji Ichimura¹, Toshihiro Kogure¹ (1. UTokyo)

Keywords:

biomineral,manganese,magnetite,EPMA,FIB-TEM

A manganese-rich tissue found in the lower-posterior part of radular teeth of some chitons was investigated mineralogically. The tissue in Placiphorella stimpsoni contains 50-55, 8-9, 4-7 wt% of iron, manganese, and copper, respectively. From a result of FIB-TEM, it was composed of aggregates of spinel crystals with a size of 10-30 nm, with no preferred orientation. This study will extend new findings on the relationship between transition metals and biomineralization.