| Reference Type | Journal (article/letter/editorial) |
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| Title | Magnetite exsolution in almandine garnet |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Brearley, A. J. | Author |
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| Champness, P. E. | Author |
| Year | 1986 (December) | Volume | 50 |
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| Issue | 358 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_50/50-358-621.pdf+ |
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| DOI | doi:10.1180/minmag.1986.050.358.07Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3906 | Long-form Identifier | mindat:1:5:3906:6 |
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| GUID | 0 |
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| Full Reference | Brearley, A. J., Champness, P. E. (1986) Magnetite exsolution in almandine garnet. Mineralogical Magazine, 50 (358) 621-633 doi:10.1180/minmag.1986.050.358.07 |
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| Plain Text | Brearley, A. J., Champness, P. E. (1986) Magnetite exsolution in almandine garnet. Mineralogical Magazine, 50 (358) 621-633 doi:10.1180/minmag.1986.050.358.07 |
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| In | (1986, December) Mineralogical Magazine Vol. 50 (358) Mineralogical Society |
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| Abstract/Notes | AbstractThree almandine-rich metamorphic garnets have been studied by analytical electron microscopy and electron microprobe analysis. Electron microprobe analyses with total Fe calculated as Fe2+ show that there are no significant departures from stoichiometry due to the presence of Fe3+ in any of the garnets studied. However, in the transmission electron microscope (TEM) all the garnets were found to contain myriad spherical, iron-rich particles up to 400 Γ
in diameter. Microdiffraction techniques have revealed that the particles are a cubic spinel phase, consistent with magnetite. There is no crystallographic relationship between the host garnet and the particles, a rare situation for exsolution processes. The presence of such particles is interpreted in terms of the exsolution of magnetite from almandine garnet during cooling. This can apparently occur at temperatures below 55Β°C. The size of the particles is a qualitative indicator of the cooling rate of the rock, but is also dependent on the original Fe3+ content of the host garnet. |
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