| | Journal (article/letter/editorial) | j, Japan. Assoc. Min. Petr.Econ. Geol. 81, 341-347, 1986 Tephroite and knebelite from Hijikuzu Mine...Mine , Iwate Prefecture, Japan WATCHARAPORN KEANKEO*, TsuYosHIKITAMURA** and KATSUTOSHI TANIDA** *Department...Katahira,Sendai980.Japan. Tephroite and knebelite samples from the Hijikuzu mine were chemically analyzed...the bedded manganese ore deposits of the Hijikuzu mine in the highly metamorphosed Jurassic quartzite caused...formulas (Mn,.97Mg0.03Ca0.02)2.02Si0.9904.00 for tephroite and (Mn1.34Fe2+0.61Mg0.07)2.02Si0.9904.00 for | | | Journal (article/letter/editorial) | Michigan 48824-1115,U.S.A. Ansrru,cr Manganoan fayalite is usually found associatedwith sedimentary iron-manganeseore... a member ofthe FerSiOo-MnrSiOo solid solution series,was originally thought to be restricted in its...literature. These occurrences include manganoan fayalite in nordmarkite at Shefford Mountain, Quebec(Frisch...and,in a pegmatite located in the Fukushima Prefecture, Japan (Omori et al., 1950;Omori and Hasegawa,1951)...many of the reported fayalite samples in igneous rocks are actually Mn-rich fayalite. Reexamination by Mills |
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