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
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Janggunite, a new manganese hydroxide mineral from the Janggun mine, Bonghwa, Korea | ||
| Journal | Mineralogical Magazine | ISSN | 0026-461X |
| Authors | Kim, Soo Jin | Author | |
| Year | 1977 (December) | Volume | 41 |
| Page(s) | 519-523 | Issue | 320 |
| Publisher | Mineralogical Society | ||
| Download URL | https://rruff.info/doclib/MinMag/Volume_41/41-320-519.pdf+ | ||
| DOI | doi:10.1180/minmag.1977.041.320.14Search in ResearchGate | ||
| Mindat Ref. ID | 2828 | Long-form Identifier | mindat:1:5:2828:2 |
| GUID | d0f49ccf-1df6-4e34-839c-dda659c52612 | ||
| Full Reference | 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 | ||
| Plain Text | 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 | ||
| In | (1977, December) Mineralogical Magazine Vol. 41 (320) Mineralogical Society | ||
| Abstract/Notes | SummaryJanggunite 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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