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oxyannite

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Journal Article
Published: 01 December 2001
Clays and Clay Minerals (2001) 49 (6): 455–491.
... is increased, the sample first evolves along an annite–oxyannite join, until all H is lost via the oxybiotite reaction (Fe 2+ + OH − ⇌Fe 3+ + O 2− + H↑). It then evolves along an oxyannite–ferrioxyannite join, where ideal ferrioxyannite, KFe 3+ 8/3 □ 1/3 AlSi 3 O 12 , is defined as the product resulting from...
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Journal Article
Published: 01 October 1983
American Mineralogist (1983) 68 (9-10): 880–899.
...+Ca+Ba) + Ti + ½ Al xc VI = 7.0, where Al xc VI = (Al+Cr) VI − Al IV + (K+Na+2Ca+2Ba)], which allocates a vacancy for each Ti and 2 Al xc VI . This iterative normalization eliminates charge excess, and permits Fe 3+ to be estimated (exclusive of oxyannite). A model chemical system for micas...
Journal Article
Published: 01 December 1963
American Mineralogist (1963) 48 (11-12): 1300–1321.
... with changes in both Fe/(Fe+Mg) and oxygen (hydrogen) fugacities. These variations are attributed to the presence of “oxyannite” KFe 2+ Fe 2 +3 AlSi 3 O 12 molecule in the biotite solid solutions. Publication authorized by the Director, U. S. Geological Survey. 16 5 1963 5 8 1963...
Journal Article
Published: 01 November 2002
European Journal of Mineralogy (2002) 14 (6): 1049–1052.
... a synthetic annite-oxyannite series has been analyzed using QSD method ( Christie et al. , 1993 ), in which the authors studied the evolution of Fe 2+ /(Fe 2+ +Fe 3+ ) at octahedral sites and Fe 2+ contributions with progressive oxidation, i.e. towards the end-member oxyannite. At present, we can...
FIGURES
Image
b vs.  Fe 2+ /Fe values for several annite and oxidized annite samples, on ...
Published: 01 December 2001
is the best line through our annite-oxyannite samples (T TR ≤350°C, 5 h treatments) and has the same meaning as the corresponding solid line in Figure 18 . All points above this line are interpreted as corresponding to annite samples that contain vacancies. The dotted line is the best line through the data
Journal Article
Published: 01 April 2006
Mineralogical Magazine (2006) 70 (2): 187–199.
..., as in annite, if one Mg is replaced by Fe 2+ in phlogopite, b tet approaches b oct in size, stabilizing the layer. However, even annite synthesized at very low f O 2 showed that 5–10% of annite always contains some oxyannite ( Hazen and Wones, 1972 ; Ferrow, 1987 a ; Redhammer et al. , 1993...
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Journal Article
Published: 01 June 2008
The Canadian Mineralogist (2008) 46 (3): 717–728.
... be called “oxyannite”, as the sum of monovalent anions at the A site is higher than the oxygen occupancy. The name is thus still annite or, using some modifiers of Bayliss et al. (2005) , iron(3+)-enriched F-bearing annite. On the other hand, using the same dominant-valency rule for the composition K(Fe...
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Journal Article
Published: 01 February 2005
American Mineralogist (2005) 90 (2-3): 399–410.
... >O 10 F 1.6 (OH) 0.4 1 “ “ “ “ Tpz , ?Fa , ?Sa not measured annite-oxyannite-ferrioxyannite series §§ IKO-Ann {K}[Fe 3 ]<AlSi 3 >O 10 (OH)2 1 H 2 O 600 n/a 3 w KCl KCl (SEM/EDS) || || EM250 “ n/a n/a 250 ## n/a n/a KCl not measured EM300 “ “ “ 300...
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Journal Article
Published: 01 May 2006
American Mineralogist (2006) 91 (5-6): 831–849.
...-crystalline reaction: [IV] Al 3+ + [VI] Fe 3+ ↔ [VI] Al 3+ + [IV] Fe 3+ ). In the case of the annite-oxyannite-ferrioxyannite series (Ann-oxy-ferrioxy), following Rancourt et al. (2001) , annite-oxyannite (Fe 2+ + OH − ↔ Fe 3+ + O 2− + H↗) and oxyannite-ferrioxyannite (3 Fe 2+ ↔ 2 Fe 3+ + [VI...
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Journal Article
Published: 01 August 2015
European Journal of Mineralogy (2015) 27 (5): 603–616.
... the activity–composition relationship of Tschermak substituted iron biotites, and of Berman et al. (2007) , who obtained phase-equilibrium constraints on the stability of Mg-Fe-Al biotite. Eugster & Wones (1962) emphasized the importance of Fe 3+ in annite and suggested that an oxyannite end...
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Journal Article
Published: 01 April 2008
American Mineralogist (2008) 93 (4): 632–643.
... a detailed study, by means of a combination of several techniques, of the transformations annite → oxyannite, through the reaction Fe 2+ + OH − → Fe 3+ + O 2− + H↑, and oxyannite → ferryoxyannite through the reaction 3Fe 2+ → 2Fe 3+ + VI □ + Fe↑. Their analysis was corroborated by quantitative...
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Journal Article
Published: 01 November 2004
European Journal of Mineralogy (2004) 16 (6): 989–1002.
... by other methods. To date, such detailed studies have focused on [6] Fe in phyllosilicates: a synthetic annite-oxyannite series ( Christie et al. , 1993 ; Rancourt et al. , 2001 ), synthetic and natural members of the phlogopite-annite series ( Rancourt, et al. , 1994 ; Redhammer et al. , 1995...
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Journal Article
Published: 01 April 2007
American Mineralogist (2007) 92 (4): 468–480.
...)-“oxyannite” (Fe 3+ ) in which “buffered” mica compositions are reported (Fig. 7 ), micas MS7, MS8(1), and MS8(2) fall well above the HM (Hematite-Magnetite) buffer, which represents the highest f O 2 values found in the crystallization of magmas ( Kleiman et al. 1992 ). Following these indications...
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Journal Article
Published: 01 January 2007
American Mineralogist (2007) 92 (1): 139–150.
... with the most reducing conditions and the least Fe 3+ in annite (6 to 15 ± 5% of total Fe; Cygan et al. 1996 ). These calculations are relatively insensitive to various assumptions regarding the energetics of, or the precise amount of this small amount of oxyannite component, the substitution mechanisms...
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Series: Geological Society, London, Special Publications
Published: 14 December 2020
DOI: 10.1144/SP489-2019-342
EISBN: 9781786205056
... the MICA + program of Yavuz (2003 a ) . The proton-deficient oxyannite–annite–phlogopite ternary diagram ( Fig. 5a ) of Beane (1974) shows that biotite from the Malanjkhand deposit has intermediate chemistry between primary biotite associated with granitoid rocks and altered biotite from the potassic...
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