| Reference Type | Journal (article/letter/editorial) |
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| Title | Iron-rich talc-opal-minnesotaite spherulites and crystallochemical relations of talc and minnesotaite |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Kager, P. C. A. | Author |
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| Oen, I. S. | Author |
| Year | 1983 (June) | Volume | 47 |
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| Issue | 343 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_47/47-343-229.pdf+ |
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| DOI | doi:10.1180/minmag.1983.047.343.14Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3504 | Long-form Identifier | mindat:1:5:3504:4 |
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| GUID | 0 |
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| Full Reference | Kager, P. C. A., Oen, I. S. (1983) Iron-rich talc-opal-minnesotaite spherulites and crystallochemical relations of talc and minnesotaite. Mineralogical Magazine, 47 (343) 229-231 doi:10.1180/minmag.1983.047.343.14 |
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| Plain Text | Kager, P. C. A., Oen, I. S. (1983) Iron-rich talc-opal-minnesotaite spherulites and crystallochemical relations of talc and minnesotaite. Mineralogical Magazine, 47 (343) 229-231 doi:10.1180/minmag.1983.047.343.14 |
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| In | (1983, June) Mineralogical Magazine Vol. 47 (343) Mineralogical Society |
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| Abstract/Notes | AbstractZoned spherulites in greenalite-siderite-silica rocks of the Emilia-San Valentin lead-zinc deposit, Sierra de Cartagena, SE Spain, show a core of iron-rich talc, (Mgl.8Fel.2)Si4Ol0(OH)2, an intermediate zone of opal-chalcedony, and a rim of minnesotaite, (Fe2.7Mg0.3)Si4Ol0(OH)2. Crystalllization of the spherulites, presumably from undercooled silica sols carrying dissolved Mg and Fe, began with the non-equilibrium precipitation of metastable iron-rich talc; the residual fluids enveloping the growing spherulites became more iron-rich in composition until metastable equilibrium between iron-rich talc and iron-enriched residual liquid impeded the further growth of the iron-rich talc; the spherulites were then overgrown by colloidal silica flocculates and a rim of minnesotaite precipitated from the iron-enriched residual fluid. The proposed crystallization model implies that, if talc and minnesotaite represent an isomorphic series, under equilibrium conditions there is a broad immiscibility region in the series. |
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