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Kim, Soo Jin (1977) Janggunite, a new manganese hydroxide mineral from the Janggun mine, Bonghwa, Korea. Mineralogical Magazine, 41 (320) 519-523 doi:10.1180/minmag.1977.041.320.14

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Reference TypeJournal (article/letter/editorial)
TitleJanggunite, a new manganese hydroxide mineral from the Janggun mine, Bonghwa, Korea
JournalMineralogical MagazineISSN0026-461X
AuthorsKim, Soo JinAuthor
Year1977 (December)Volume41
Issue320
PublisherMineralogical Society
Download URLhttps://rruff.info/doclib/MinMag/Volume_41/41-320-519.pdf+
DOIdoi:10.1180/minmag.1977.041.320.14Search in ResearchGate
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Mindat Ref. ID2828Long-form Identifiermindat:1:5:2828:2
GUID0
Full ReferenceKim, Soo Jin (1977) Janggunite, a new manganese hydroxide mineral from the Janggun mine, Bonghwa, Korea. Mineralogical Magazine, 41 (320) 519-523 doi:10.1180/minmag.1977.041.320.14
Plain TextKim, Soo Jin (1977) Janggunite, a new manganese hydroxide mineral from the Janggun mine, Bonghwa, Korea. Mineralogical Magazine, 41 (320) 519-523 doi:10.1180/minmag.1977.041.320.14
In(1977, December) Mineralogical Magazine Vol. 41 (320) Mineralogical Society
Abstract/NotesSummaryJanggunite occurs as radiating groups of flakes, flower-like aggregates, colloform bands, dendritic or arborescenl masses in the cementation zone of the supergene manganese oxide deposits. The flakes average 0·05 mm. Colour black, lustre dull, streak brownish black to dark brown. Cleavage one direction perfect. H = 23, very fragile. Dmeas = 3·59, Dcalc = 3·58. Under reflected light anisotropic and bireflectant. No internal reflections. Etching reactions: positive - HC1, HNO3, SnCl2, H2O2, H2SO4 + H2O2. Chemical formula, on the basis of O = 14, or ideally . The mineral has an orthorhombic unit cell with a 9·324, b 14·05, c 7·956 Å, Z = 4, a:b:c = 0·663:1:0·566. Important diffraction lines are 9·34(s), 7·09(s), 4·62(m), 4·17(m), 3·547(s), 3·101(s), 2·597(w), 2·469(m), 1·863(w), 1·664(w), 1·525(m), 1·405(m), D.T.A. curve shows the endothermic peaks at 250–370°C and 955°C Infra-red absorption spectral curve shows vibrations at 515 cm−1, 545 cm−1, 1025 cm−1, and 3225 cm−1. The mineral and name have been approved before publication by the Commission on New Minerals and Mineral Names, I.M.A.

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LocalityCitation Details
Janggun mine, Bonghwa County, North Gyeongsang Province, South Korea

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MineralCitation Details
Janggunite

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LocalityMineral(s)
Janggun mine, Bonghwa County, North Gyeongsang Province, South Korea Janggunite


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