| Reference Type | Journal (article/letter/editorial) |
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| Title | Okayamalite, Ca2B2SiO7, a new mineral, boron analogue of gehlenite |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Matsubara, Satoshi | Author |
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| Miyawaki, Ritsuro | Author |
| Kato, Akira | Author |
| Yokoyama, Kazumi | Author |
| Okamoto, Akiyoshi | Author |
| Year | 1998 (October) | Volume | 62 |
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| Page(s) | 703-706 | Issue | 5 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_62/62-5-703.pdf+ |
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| DOI | doi:10.1180/002646198547936Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 323 | Long-form Identifier | mindat:1:5:323:2 |
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| GUID | 6db5fb70-a17a-47f6-85c8-9b88dd4e5417 |
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| Full Reference | Matsubara, Satoshi, Miyawaki, Ritsuro, Kato, Akira, Yokoyama, Kazumi, Okamoto, Akiyoshi (1998) Okayamalite, Ca2B2SiO7, a new mineral, boron analogue of gehlenite. Mineralogical Magazine, 62 (5) 703-706 doi:10.1180/002646198547936 |
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| Plain Text | Matsubara, Satoshi, Miyawaki, Ritsuro, Kato, Akira, Yokoyama, Kazumi, Okamoto, Akiyoshi (1998) Okayamalite, Ca2B2SiO7, a new mineral, boron analogue of gehlenite. Mineralogical Magazine, 62 (5) 703-706 doi:10.1180/002646198547936 |
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| Abstract/Notes | Okayamalite, Ca2B2SiO7, tetragonal, P4̄21m, a = 7.116, c = 4.815 Å, Z = 2, is a new member of melilite group, the boron analogue of gehlenite. Electron microprobe analysis gave CaO 46.28, B2O3 28.50, SiO2 24.24, Al2O3 0.36, total 99.38 wt.%, corresponding to Ca2.01B2.00Si0.98Al0.02O7, a natural counterpart of Ca2B2SiO7 known only synthetically. The strongest lines in the X-ray powder diffraction pattern are 3.479 (40)(111), 2.862 (55)(201), 2.654 (100)(211), 2.129 (20)(301), 1.920 (35)(212), 1.644 (29)(312), very close to those of the synthetic material (a = 7.115, and c = 4.812 ). It is creamy white in colour with an earthy appearance due to the fine grain size. Streak white, cleavage not observed. Hardness ∼5½. Density calculated on the ideal formula is 3.30 g/cm3. It is optically uniaxial negative with ω = 1.700, and ɛ = 1.696. It occurs as patches of a few millimetres across in grey homogeneous-looking aggregate of wollastonite, vesuvianite, calcite and johnbaumite from Fuka mine, Bicchu-cho, Okayama Prefecture, Japan. The patches consist of very fine grains of the mineral up to 30 μm. Okayamalite is considered to be a product after the reaction formula: CaCO3 + CaSiO3 + B2O3 = Ca2B2SiO7 + CO2, arising from boron metasomatism of a wollastonite-calcite aggregate. The name is for the prefecture. |
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