| Reference Type | Journal (article/letter/editorial) |
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| Title | Parasibirskite, a new mineral from Fuka, Okayama Prefecture, Japan |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Kusachi, I. | Author |
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| Takechi, Y. | Author |
| Henmi, C. | Author |
| Kobayashi, S. | Author |
| Year | 1998 (August) | Volume | 62 |
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| Issue | 4 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_62/62-4-521.pdf+ |
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| DOI | doi:10.1180/002646198547891Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 301 | Long-form Identifier | mindat:1:5:301:0 |
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| GUID | 0 |
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| Full Reference | Kusachi, I., Takechi, Y., Henmi, C., Kobayashi, S. (1998) Parasibirskite, a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 62 (4) 521-525 doi:10.1180/002646198547891 |
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| Plain Text | Kusachi, I., Takechi, Y., Henmi, C., Kobayashi, S. (1998) Parasibirskite, a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 62 (4) 521-525 doi:10.1180/002646198547891 |
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| Abstract/Notes | Parasibirskite, with the ideal formula Ca2B2O5·H2O, is a new mineral species found at Fuka, Okayama Prefecture, Japan. It is a polymorph of sibirskite, CaHBO3, and occurs as subparallel aggregates of tabular crystals up to 40 × 20 × 3 µm in size. Associated minerals are takedaite, olshanskyite, sibirskite, frolovite and calcite. The mineral is white, and has a weak pearly luster. Optically, the mineral is biaxial positive, α 1.556(2), β 1.593(2), γ 1.663(2) (λ 589 nm). The Vickers microhardness of aggregates is 121 kg mm−2. The mineral is monoclinic with space group of P21/m, a 6.722(4), b 5.437(2), c 3.555(2) Å, β 93.00(5)°, V 129.8(2), Å3. The strongest lines in the X-ray powder pattern [d in Å (I)(hkl)] are 2.237(100)(300), 6.73(70)(100), 2.975(60)(011), 3.354(30)(200), 2.855(20)(210) and 1.776(20) (002). Wet chemical analysis, electron-microprobe analysis and ICP emission spectrometry give the values CaO 56.06 %, B2O3 34.10 %, H2O 9.97 % and total 100.13%. The empirical formula calculated on the basis of O = 6 is Ca1.985B1.945O4.901·1.099H2O, for Z = 1, Dcalc 2.54 and Dmeas 2.50(1) g cm−3. Parasibirskite is formed by hydrothermal alteration of takedaite. |
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