| Reference Type | Journal (article/letter/editorial) |
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| Title | Stability and relations of the Al-Fe epidotes |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | Strens, R. G. J. | Author |
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| Year | 1965 (September) | Volume | 35 |
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| Issue | 271 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_35/35-271-464.pdf+ |
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| DOI | doi:10.1180/minmag.1965.035.271.02Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 5905 | Long-form Identifier | mindat:1:5:5905:7 |
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| GUID | 0 |
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| Full Reference | Strens, R. G. J. (1965) Stability and relations of the Al-Fe epidotes. Mineralogical Magazine and Journal of the Mineralogical Society, 35 (271) 464-475 doi:10.1180/minmag.1965.035.271.02 |
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| Plain Text | Strens, R. G. J. (1965) Stability and relations of the Al-Fe epidotes. Mineralogical Magazine and Journal of the Mineralogical Society, 35 (271) 464-475 doi:10.1180/minmag.1965.035.271.02 |
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| In | (1965) Mineralogical Magazine Vol. 35 (271) Mineralogical Society |
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| Abstract/Notes | SummaryThe various (P, T) stability fields of iron-free zoisite have been deduced for systems containing excess silica and water with Ca : Al ratios ranging from 1 : 2 (anorthite) to 3:2 (grossular). Zoisite is a possible phase in all systems with Ca:Al lower than 3:2, attaining its maximum stability at the zoisite (Ca:Al = 2:3) and prehnite (Ca:Al = 2:2) compositions.The consequences of varying the Al : Fe ratio are next examined. Zoisite with 4 % pistacite is stable to 525° at 2 kilobars, compared with ∼585° for clinozoisite and 620 to 630° for epidote (Ps35) at the same pressure. Increasing iron content also stabilizes epidote minerals relative to their low-temperature and high-pressure decomposition products.Examples of natural zoisite-clinozoisite, zoisite-epidote, and clinozoisite-epidote assemblages are described. It is concluded that zoisite-epidote mixtures result from the disproportionation of clinozoisite outside its own stability field, but within those of zoisite and epidote. The assemblage zoisite-clinozoisite is probably not stable, but further evidence is needed on this point. The assemblage clinozoisite-epidote is stable below 550° C, at which temperature the solvus in the Al-Fe series closes. |
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