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Kusachi, I., Henmi, C., Kobayashi, S. (1995) Takedaite, a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 59 (396) 549-552 doi:10.1180/minmag.1995.059.396.15

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Reference TypeJournal (article/letter/editorial)
TitleTakedaite, a new mineral from Fuka, Okayama Prefecture, Japan
JournalMineralogical MagazineISSN0026-461X
AuthorsKusachi, I.Author
Henmi, C.Author
Kobayashi, S.Author
Year1995 (September)Volume59
Page(s)549-552Issue396
PublisherMineralogical Society
Download URLhttps://rruff.info/doclib/MinMag/Volume_59/59-396-549.pdf+
DOIdoi:10.1180/minmag.1995.059.396.15Search in ResearchGate
Mindat Ref. ID2673Long-form Identifiermindat:1:5:2673:8
GUID797f51d7-aebe-473b-937d-a76b4b89cc55
Full ReferenceKusachi, I., Henmi, C., Kobayashi, S. (1995) Takedaite, a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 59 (396) 549-552 doi:10.1180/minmag.1995.059.396.15
Plain TextKusachi, I., Henmi, C., Kobayashi, S. (1995) Takedaite, a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 59 (396) 549-552 doi:10.1180/minmag.1995.059.396.15
In(1995, September) Mineralogical Magazine Vol. 59 (396) Mineralogical Society
Abstract/NotesAbstractTakedaite, Ca3B2O6, has been found in crystalline limestone near gehlenite−spurrite skarns at Fuka, Okayama Prefecture. It occurs as aggregates of granular crystals up to 0.8 mm long and 0.3 mm wide. The mineral is associated with nifontovite, olshanskyite, pentahydroborite, frolovite, sibirskite, calcite and an unidentified mineral, is white or pale gray, and has a vitreous luster. Takedaite is trigonal with space group of Rc, a = 8.638(1), c = 11.850(2)Å, Z = 6. The strongest lines in the X-ray powder pattern [d in A(I)(hkl)] are 2.915(100)(113), 1.895(75)(223), 2.756(61)(104), 2.493(44)(300), 2.044(21) (214,131), 2.160(19)(220), 1.976(18)(006), 1.549(12)(306). The Vickers microhardness is 478 kg mm−2 and the Mohs hardness 4.5. The density is 3.10(2) g cm−3 (meas.) and 3.11 g cm−3 (calc.). Wet chemical analyses give the values CaO 71.13%, B2O3 28.41%, ig. loss 0.14%, and total 99.68%. The empirical formula calculated on the basis of O = 6 is Ca3.053B1.965O6, with the simplified formula of Ca3B2O6.

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Locality Pages

LocalityCitation Details
Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan

Mineral Pages

MineralCitation Details
Takedaite

Mineral Occurrences

LocalityMineral(s)
Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan Takedaite


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