| Reference Type | Journal (article/letter/editorial) |
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| Title | Stabilization of trivalent Mn in natural tetragonal hydrogarnets on the join ‘hydrogrossular’—henritermierite, Ca3Mn23+ [SiO4]2[H4O4] |
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| Journal | Mineralogical Magazine |
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| Authors | Hålenius, U. | Author |
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| Year | 2004 (April) | Volume | 68 |
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| Issue | 2 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/0026461046820190Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 243540 | Long-form Identifier | mindat:1:5:243540:8 |
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| GUID | 0 |
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| Full Reference | Hålenius, U. (2004) Stabilization of trivalent Mn in natural tetragonal hydrogarnets on the join ‘hydrogrossular’—henritermierite, Ca3Mn23+ [SiO4]2[H4O4]. Mineralogical Magazine, 68 (2) 335-341 doi:10.1180/0026461046820190 |
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| Plain Text | Hålenius, U. (2004) Stabilization of trivalent Mn in natural tetragonal hydrogarnets on the join ‘hydrogrossular’—henritermierite, Ca3Mn23+ [SiO4]2[H4O4]. Mineralogical Magazine, 68 (2) 335-341 doi:10.1180/0026461046820190 |
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| Abstract/Notes | AbstractFour relatively intense and broad absorption bands centred at ∼12500, ∼19500, ∼21500 and ∼23000 cm–1 were recorded in polarized electronic single-crystal spectra of natural, optically uniaxial and pleochroic hydrogarnets with henritermierite contents ranging from 35 to 97 mol.%. These absorption bands arise from spin-allowed electronic d-d transitions in trivalent Mn located at the axially distorted six-coordinated site of the tetragonal hydrogarnet structure.The crystal field stabilization energy (CFSE) for trivalent Mn at the Mn site, as derived from band energies, is ∼185 kJ/mol. This considerably higher CFSE for Mn3+ in tetragonal hydrogarnets as compared to cubic garnets (130 –145 kJ/mol) explains the natural occurrence of close to end-member tetragonal Mn3+-hydrogarnets while only limited Mn3+-substitution is observed in natural cubic garnets.The fact that incorporation of Mn3+ at intermediate concentrations stabilizes the tetragonal hydrogarnets indicates the potential natural existence of a number of new, partially Mn3+-substituted, hydrogarnets, e.g. tetragonal Mn3+-bearing ‘hydroandradite’. |
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