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Hokkaido University Collection of Scholarly and Academic Papers >
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Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy >
Vol.XXI, No.4 >
Inesite from the Kokuriki Mine, Hokkaido, Japan
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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