Iseite, Mn2Mo3O8, a new mineral from Ise, Mie Prefecture, Japan

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概要

• 論文の詳細を見る

• Iseite, Mn2Mo3O8, a new mineral that is a Mn-dominant analogue of kamiokite, is found in the stratiform ferromanganese deposit, Shobu area, Ise City, Mie Prefecture, Japan. It is the first mineral species that includes both Mn and Mo as essential constituents. Iseite is iron-black in color and has a submetallic luster. It occurs as aggregates up to about 1 mm in size made of minute crystals (<20 μm). Iseite has a zoned structure closely associated with undetermined Mn-Fe-Mo oxide minerals with hexagonal forms, and it occasionally coexists with small amounts of powellite. Its Mohs hardness is 4-5, and its calculated density is 5.85 g/cm3. The empirical formula of iseite is (Mn1.787Fe0.193)Σ1.980Mo3.010O8. Its simplified ideal formula is written as Mn2Mo3O8. The mineral is isostructural with kamiokite (hexagonal, P63mc). The unit cell parameters are a = 5.8052 (3) Å, c = 10.2277 (8) Å, V = 298.50 (4) Å3, and Z = 2. The Rietveld refinement using synchrotron radiation (λ = 0.413 Å) powder XRD data converges to Rwp = 3.11%, and confirms two independent Mn sites—tetrahedral and octahedral—in the crystal structure of iseite, indicating the structure formula MnIVMnVIMo3O8.

著者

• Nishio-hamane Daisuke

  The Inst. For Solid State Physics The Univ. Of Tokyo

• Minakawa Tetsuo

  Department Of Earth Science Faculty Of Science Ehime University

• NISHIO-HAMANE Daisuke

  The institute for Solid State Physics, University of Tokyo

• TOMITA Norimitsu

  Department of Earth Science, Faculty of Science, Ehime University

• INABA Sachio

  Inaba-Shinju Corporation

関連論文

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• Crystal chemistry of Mn2+-, Sr-rich and REE-bearing piemontite from the Kamisugai mine in the Sambagawa metamorphic belt, Shikoku, Japan
• Ehimeite, NaCa_2Mg_4CrSi_6Al_2O_(OH)_2 : The first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan
• Miyahisaite, (Sr,Ca)_2Ba_3(PO_4)_3F, a new mineral of the hedyphane group in the apatite supergroup from the Shimoharai mine, Oita Prefecture, Japan
• Iseite, Mn2Mo3O8, a new mineral from Ise, Mie Prefecture, Japan
• Iseite, Mn_2Mo_3O_8, a new mineral from Ise, Mie Prefecture, Japan

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