| Reference Type | Journal (article/letter/editorial) |
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| Title | Sadanagaite and subsilicic ferroan pargasite from thermally metamorphosed rocks in the Nōgō-Hakusan area, central Japan |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Sawaki, Takayuki | Author |
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| Year | 1989 (March) | Volume | 53 |
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| Page(s) | 99-106 | Issue | 369 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_53/53-369-99.pdf+ |
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| DOI | doi:10.1180/minmag.1989.053.369.11Search in ResearchGate |
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| Mindat Ref. ID | 1478 | Long-form Identifier | mindat:1:5:1478:0 |
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| GUID | e2905ee8-0337-4042-b766-e8d988b0360b |
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| Full Reference | Sawaki, Takayuki (1989) Sadanagaite and subsilicic ferroan pargasite from thermally metamorphosed rocks in the Nōgō-Hakusan area, central Japan. Mineralogical Magazine, 53 (369) 99-106 doi:10.1180/minmag.1989.053.369.11 |
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| Plain Text | Sawaki, Takayuki (1989) Sadanagaite and subsilicic ferroan pargasite from thermally metamorphosed rocks in the Nōgō-Hakusan area, central Japan. Mineralogical Magazine, 53 (369) 99-106 doi:10.1180/minmag.1989.053.369.11 |
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| In | (1989, March) Mineralogical Magazine Vol. 53 (369) Mineralogical Society |
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| Abstract/Notes | AbstractHigh-alumina subsilicic calcic amphiboles, including sadanagaite and subsilicic ferroan pargasite, are found in rock samples from the contact aureole in the Nōgō-Hakusan area, central Japan. They occur in the reaction zones between dark fragments and the surrounding crystalline limestone of the pyroxene hornfels facies zone. The dark fragments which underwent K-metasomatism are originally basaltic rocks. The sadanagaite and subsilicic ferroan pargasite have high Al2O3 (16–19 wt. %) and K2O (3.6–4.3 wt. %) contents. The Si value ranges from 5.38 to 5.64 and the total Al ranges from 3.10 to 3.43 when cation ratios are calculated on the basis of O = 23. The calculated unit cell parameters of sadanagaite are a 10.00 (1), b 18.06 (2), c 5.355 (4) Å, β 105.52(7)°, V 932(1) Å3. The A-sites of the amphiboles is occupied almost entirely by K and Na; the amphiboles are saturated with the edenite component. The amphiboles show a larger extent of tschermakite-type substitution [(Mg,Fe)Si⇌AlAl] than does ordinary pargasite. Sadanagaite is probably stable at the temperature above the upper amphibolite facies. |
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