Host: Japan Association of Mineralogical Sciences
Lithiophorite from Nagatare pegmatite consists of fine disk-shape crystals with 1 µm in diameter, 500 nm in thickness. The chemical composition and unit cell parameters are (Li1.00Al2.00)Σ3.00(Mn4+2.00Mn3+0.86Fe3+0.03Al0.11)Σ3.00O6(OH)6, and a = 2.921(5), c = 28.44(5) and V = 210.1(7). Alternative MnO6 octahedral sheet and (Al,Li)(OH)6 octahedral sheet were observed in STEM-HAADF image. HRTEM image indicates ordered structure in (Al,Li)(OH)6 octahedral sheet.