A new occurrence of hausmannite and tephroite from a manganese deposit at Himegamori, Iwate Prefecture

概要

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A new occurence of hausmannite and tephroite from a manganese deposit at Himegamori, Iwate Prefecture, is described. The minerals occurred in granular aggregetes in hornstone of Paleozoic formations. A chemical composition of hausmannite is given as (Mn2•94 Fe0•02 Mg0•02)2•98O4•00 Optical constants of tephroite are α=1.782, β=1.802, γ=1.812, γ-α=0.030 and, 2V=(-) 65°. And its chemical composition is given as (Mn1•81 Fe0•02 Ca0•04 Mg0•12) 1•99 Si1•00 O4•00 These minerals were believed to be formed from Azuki ore in hornstone by contact metamorphism of granitic intrusion.
日本鉱物科学会の論文