| Reference Type | Journal (article/letter/editorial) |
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| Title | Zussmanite in ferruginous metasediments from Southern Central Chile |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Massonne, H.-J. | Author |
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| Hervé, F. | Author |
| Medenbach, O. | Author |
| Muñoz, V. | Author |
| Willner, A. P. | Author |
| Year | 1998 (December) | Volume | 62 |
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| Issue | 6 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_62/62-6-869.pdf+ |
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| DOI | doi:10.1180/002646198548098Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 344 | Long-form Identifier | mindat:1:5:344:5 |
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| GUID | 0 |
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| Full Reference | Massonne, H.-J., Hervé, F., Medenbach, O., Muñoz, V., Willner, A. P. (1998) Zussmanite in ferruginous metasediments from Southern Central Chile. Mineralogical Magazine, 62 (6) 869-876 doi:10.1180/002646198548098 |
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| Plain Text | Massonne, H.-J., Hervé, F., Medenbach, O., Muñoz, V., Willner, A. P. (1998) Zussmanite in ferruginous metasediments from Southern Central Chile. Mineralogical Magazine, 62 (6) 869-876 doi:10.1180/002646198548098 |
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| Abstract/Notes | AbstractZussmanite KFe13[AlSi17O42](OH)14, a modulated 2:1 layer silicate, has so far been found only in iron-rich metasediments from Laytonville, California (Agrellet al.), 1965). A new occurrence is reported here from Punta Nihue north of Valdivia, Chile, in banded stilpnomelane-schists. These are intercalated in the ‘Western Series’, a complex of low-grade metamorphic rocks with local high-pressure, low-temperature overprint (e.g. blueschists).The rock contains conspicuous porphyroblasts of zussmanite of mm size and is composed of chemically distinct bands with the subsequent assemblages: (1) zussmanite-stilpnomelane-quartz, (2) siderite-quartz±stilpnomelane (3) apatite-stilpnomelane-quartz±siderite. The chemical composition of zussmanite, (K0.80Na0.05Ba0.01)(Fe11.292+Mg1.11Mn0.25Fe0.143+Cr0.01Al0.19Ti0.01)[Al1.23Si16.77O42](OH)14, its optical properties and X-ray data correlate well with the Californian occurrence. Additionally, we present new IR data. In type (2) bands of fine-grained crystals of a K,Al poor mineral formed from siderite and quartz. Its chemical composition is close to that of zussmanite. A similar phase was also reported from Laytonville, California (Muir Wood, 1980).The rarity of rock-forming zussmanite can be explained by its occurrence in strongly Fe-rich and reduced rocks, as well as, by a possibly narrowP-Tstability field. |
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