Experimental determination of the upper stability of scorzalite, FeAl2[OH/PO4]2, and the occurrence of minerals with a composition intermediate between scorzalite and lazulite(ss) up to the conditions of the amphibolite facies

P. Schmid-Beurmann; G. Morteani; L. Cemič

doi:10.1007/bf01172485

Experimental determination of the upper stability of scorzalite, FeAl₂[OH/PO₄]₂, and the occurrence of minerals with a composition intermediate between scorzalite and lazulite(ss) up to the conditions of the amphibolite facies

P. Schmid-Beurmann, G. Morteani, L. Cemič

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Christian-Albrechts-University of Kiel

Publikation: Beitrag in Fachzeitschrift › Artikel › Begutachtung

17 Zitate (Scopus)

Abstract

The stability field of scorzalite (FeAl₂[OH/PO₄]₂) was investigated in the P-T range from 487 to 684°C and 0.1 to 0.3 GPa in hydrothermal experiments. The oxygen fugacity was fixed by the Ni/NiO buffer. Scorzalite shows a decomposition according to the reaction: FeAl₂[OH/PO₄]₂) ⇔ FeAlPO₅+AlPO₄ (berlinite) + H₂O. The mean standard enthalpy and standard entropy of reaction were determined as ΔH⁰_R = 94(13) kJ, ΔS⁰_R = 180(16) JK^-1. A ⁵⁷Fe-Mößbauer spectroscopic examination showed that about 4 atomic % of the total Fe in scorzalite is trivalent.

Originalsprache	Englisch
Seiten (von - bis)	211-222
Seitenumfang	12
Fachzeitschrift	Mineralogy and Petrology
Jahrgang	61
Ausgabenummer	1-4
DOIs	https://doi.org/10.1007/bf01172485
Publikationsstatus	Veröffentlicht - 1998

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title = "Experimental determination of the upper stability of scorzalite, FeAl2[OH/PO4]2, and the occurrence of minerals with a composition intermediate between scorzalite and lazulite(ss) up to the conditions of the amphibolite facies",

abstract = "The stability field of scorzalite (FeAl2[OH/PO4]2) was investigated in the P-T range from 487 to 684°C and 0.1 to 0.3 GPa in hydrothermal experiments. The oxygen fugacity was fixed by the Ni/NiO buffer. Scorzalite shows a decomposition according to the reaction: FeAl2[OH/PO4]2) ⇔ FeAlPO5+AlPO4 (berlinite) + H2O. The mean standard enthalpy and standard entropy of reaction were determined as ΔH0R = 94(13) kJ, ΔS0R = 180(16) JK-1. A 57Fe-M{\"o}{\ss}bauer spectroscopic examination showed that about 4 atomic % of the total Fe in scorzalite is trivalent.",

author = "P. Schmid-Beurmann and G. Morteani and L. Cemi{\v c}",

year = "1998",

doi = "10.1007/bf01172485",

language = "English",

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Experimental determination of the upper stability of scorzalite, FeAl₂[OH/PO₄]₂, and the occurrence of minerals with a composition intermediate between scorzalite and lazulite(ss) up to the conditions of the amphibolite facies. / Schmid-Beurmann, P.; Morteani, G.; Cemič, L.
in: Mineralogy and Petrology, Jahrgang 61, Nr. 1-4, 1998, S. 211-222.

Publikation: Beitrag in Fachzeitschrift › Artikel › Begutachtung

TY - JOUR

T1 - Experimental determination of the upper stability of scorzalite, FeAl2[OH/PO4]2, and the occurrence of minerals with a composition intermediate between scorzalite and lazulite(ss) up to the conditions of the amphibolite facies

AU - Schmid-Beurmann, P.

AU - Morteani, G.

AU - Cemič, L.

PY - 1998

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AB - The stability field of scorzalite (FeAl2[OH/PO4]2) was investigated in the P-T range from 487 to 684°C and 0.1 to 0.3 GPa in hydrothermal experiments. The oxygen fugacity was fixed by the Ni/NiO buffer. Scorzalite shows a decomposition according to the reaction: FeAl2[OH/PO4]2) ⇔ FeAlPO5+AlPO4 (berlinite) + H2O. The mean standard enthalpy and standard entropy of reaction were determined as ΔH0R = 94(13) kJ, ΔS0R = 180(16) JK-1. A 57Fe-Mößbauer spectroscopic examination showed that about 4 atomic % of the total Fe in scorzalite is trivalent.

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