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Vol.XXI, No.4 >

Inesite from the Kokuriki Mine, Hokkaido, Japan

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Title: Inesite from the Kokuriki Mine, Hokkaido, Japan
Authors: Togari, Kenji Browse this author
Akasaka, Masahide Browse this author
Kawaguchi, Yoshiyuki Browse this author
Issue Date: Feb-1986
Publisher: 北海道大学
Journal Title: 北海道大学理学部紀要
Journal Title(alt): Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy
Volume: 21
Issue: 4
Start Page: 669
End Page: 677
Abstract: Inesite occurs in veinlet cutting hematite ore from the Kokuriki mine, eastern Hokkaido. Its associated minerals are rhodochrosite, barite and quartz. The inesite forms fine prisms up to 1 mm long and is pale orange in color. Refractive indices are: α=1.618(3), β=1.639(3) and γ=1.656(3). Biaxial, negative. 2V(meas.)=67-70°. The composition is as follows: SiO2 45.94, Al2O3 0.02, Fe2O3 0.57, MnO 37.50, MgO 0.10, CaO 8.60, Na2O 0.04, K2O 0.04, H2O 8.90, Total 101.71 wt.%. The H2O content was determined by a thermogravimetric analysis. The empirical formula is calculated as: (Ca1.97Na0.02K0.01)Σ2.00(Mn6.80Mg0.03) Σ6.83-(Si9.84Fe3+0.09Al0.01)Σ9.94O35.00H12.72. Unit-cell parameters based on morphological cell were determined by X-ray powder diffraction as follows: a=8.938(4), b=9.259(5), c=11.959(5)Å, a=91.96(7)°, β=132.72(3)°, γ=94.36(6)°. Crystal field spectra indicate that the orange color of the inesite may be caused by Mn3+ converted from a part of Mn2+ .
Type: bulletin (article)
URI: http://hdl.handle.net/2115/36746
Appears in Collections:Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy > Vol.XXI, No.4

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