Ferro-ferri-holmquistite, <italic>□</italic>Li2(Fe2+3Fe3+2) Si8O22(OH)2, Fe2+Fe3+ analogue of holmquistite, from the Iwagi islet, Ehime, Japan

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Abstract □ 2 (Fe3 2 + Fe2 3 +) Si8 O22 (OH) 2, was found in albitized granite from the Iwagi islet, Ehime, Japan. Ferro-ferri-holmquistite is a C Fe2 + 3 + 1/2. Its cleavage is perfect on {210}. Measured and calculated densities are D meas. = 3.2  g cm- 3 D calc. = 3.317  g cm- 3 α = 1.685, β = 1.713 and γ = 1.727, and is pleochroic, with X =  pale blue ∼ Y =  deep blue ∼ Z =  deep blue ∼ X > Z > Y. The magnetic susceptibility is similar to the associated biotite. Ferro-ferri-holmquistite is insoluble in HCl, HNO3 and H2 SO4. The empirical formula calculated on the basis of Σ + = A (K0.01 Na0.06)Σ 0.07 B (Li1.95 Na0.04 Ca0.01)Σ 2.00 C (Fe2.82 2 + Fe1.39 3 + Al0.51 Mg0.22 Mn0.05 2 + Ti0.01)Σ 5.00 T (Si7.98 Al0.02)Σ 8.00 22 (OH) 1.94 F0.06. Structure refinement converged to R 1 =  4.22 %. The space group is orthorhombic Pnma a =  18.5437 (2) Å, b =  17.9222 (1) Å, c =  5.3123 (1) Å and V =  1765.51 (1) Å3. Based on the refined site occupancies, the structural formula can be written as A Na0.062 M 4 1.952 Na0.048)Σ 2.000 M 1 1.770 2 + Mg0.230)Σ 2.000 M 2 1.446 3 + Fe0.102 2 + Al0.452)Σ 2.000 M 3 0.891 2 + Mg0.109)Σ 1.000 T Si8 O22 (OH) 2 (Z =  4). Three OH-stretching IR bands, centered at 3614, 3631 and 3644 cm- 1 M 1 M 1 M 3 =  FeFeFe, MgFeFe (including FeMgFe and FeFeMg) and MgMgFe (including MgFeMg and FeMgMg), respectively, based on the IR studies of the orthorhombic Pnma amphiboles.

Standort: Deutsche Nationalbibliothek Frankfurt am Main

Umfang: Online-Ressource

Sprache: Englisch

Erschienen in: Ferro-ferri-holmquistite, □Li₂(Fe²⁺₃Fe³⁺₂) Si₈O₂₂(OH)₂, Fe²⁺Fe³⁺ analogue of holmquistite, from the Iwagi islet, Ehime, Japan ; volume:34 ; number:5 ; year:2022 ; pages:425-438 ; extent:14
European journal of mineralogy ; 34, Heft 5 (2022), 425-438 (gesamt 14)

Urheber: Nagashima, Mariko
Imaoka, Teruyoshi
Kano, Takashi
Kimura, Jun-ichi
Chang, Qing
Matsumoto, Takashi

DOI: 10.5194/ejm-34-425-2022

URN: urn:nbn:de:101:1-2022101305285864610573

Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Letzte Aktualisierung: 15.08.2025, 07:20 MESZ

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Nagashima, Mariko
Imaoka, Teruyoshi
Kano, Takashi
Kimura, Jun-ichi
Chang, Qing
Matsumoto, Takashi

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Ferro-ferri-holmquistite, <italic>□</italic>Li<sub>2</sub>(Fe<sup>2+</sup><sub>3</sub>Fe<sup>3+</sup><sub>2</sub>) Si<sub>8</sub>O<sub>22</sub>(OH)<sub>2</sub>, Fe<sup>2+</sup>Fe<sup>3+</sup> analogue of holmquistite, from the Iwagi islet, Ehime, Japan

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Quantification of fossil fuel CO<sub>2</sub> from combined CO, &delta;<sup>13</sup>CO<sub>2</sub> and &Delta;<sup>14</sup>CO<sub>2</sub> observations

Inter-comparison of online and offline methods for measuring ambient heavy and trace elements and water-soluble inorganic ions (NO<sub>3</sub><sup>−</sup>, SO<sub>4</sub><sup>2−</sup>, NH<sub>4</sub><sup>+</sup>, and Cl<sup>−</sup>) in PM<sub>2.5</sub> over a heavily polluted megacity, Delhi

<italic>δ</italic><sup>13</sup>C, CO<sub>2</sub>&thinsp;∕&thinsp;<sup>3</sup>He and <sup>3</sup>He&thinsp;∕&thinsp;<sup>4</sup>He ratios reveal the presence of mantle gas in the CO<sub>2</sub>-rich groundwaters of the Ardennes massif (Spa, Belgium)

Zinkgruvanite, Ba<sub>4</sub>Mn<sup>2+</sup><sub>4</sub>Fe<sup>3+</sup><sub>2</sub>(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>(SO<sub>4</sub>)<sub>2</sub>O<sub>2</sub>(OH)<sub>2</sub>, a new ericssonite-group mineral from the Zinkgruvan Zn-Pb-Ag-Cu deposit, Askersund, Örebro County, Sweden

Rotherkopfite, KNa<sub>2</sub>(Fe<sup>2+</sup><sub>2.5</sub>Ti<sup>4+</sup><sub>1.5</sub>) Fe<sup>2+</sup>(Si<sub>4</sub>O<sub>12</sub>)<sub>2</sub>, a new neptunite-group mineral without essential lithium, from Rother Kopf, Eifel volcanic fields, Germany

Igelströmite, Fe<sup>3+</sup>(Sb<sup>3+</sup>Pb<sup>2+</sup>) O<sub>4</sub>, and manganoschafarzikite, Mn<sup>2+</sup>Sb<sup>3+</sup><sub>2</sub>O<sub>4</sub>, two new members of the newly established minium group, from the Långban Mn–Fe deposit, Värmland, Sweden

Validation of a coupled <italic>δ</italic><sup>2</sup>H<sub><italic>n</italic>-alkane</sub>–<italic>δ</italic><sup>18</sup>O<sub>sugar</sub> paleohygrometer approach based on a climate chamber experiment

Manganrockbridgeite, Mn<sup>2+</sup><sub>2</sub>Fe<sup>3+</sup><sub>3</sub>(PO<sub>4</sub>)<sub>3</sub>(OH)<sub>4</sub>(H<sub>2</sub>O), a new member of the rockbridgeite group, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria

Reaction dynamics of P (<sup>4</sup>S) + O<sub>2</sub>(X <sup>3</sup>&Sigma;<sup>-</sup>) &rarr; O (<sup>3</sup>P) + PO (X <sup>2</sup>&Pi;) on a global CHIPR potential energy surface of PO<sub>2</sub>(X <sup>2</sup>A<sub>1</sub>): implication for atmospheric modelling

Quantification of fossil fuel CO<sub>2</sub> from combined CO, &delta;<sup>13</sup>CO<sub>2</sub> and &Delta;<sup>14</sup>CO<sub>2</sub> observations

Inter-comparison of online and offline methods for measuring ambient heavy and trace elements and water-soluble inorganic ions (NO<sub>3</sub><sup>−</sup>, SO<sub>4</sub><sup>2−</sup>, NH<sub>4</sub><sup>+</sup>, and Cl<sup>−</sup>) in PM<sub>2.5</sub> over a heavily polluted megacity, Delhi

<italic>δ</italic><sup>13</sup>C, CO<sub>2</sub>&thinsp;∕&thinsp;<sup>3</sup>He and <sup>3</sup>He&thinsp;∕&thinsp;<sup>4</sup>He ratios reveal the presence of mantle gas in the CO<sub>2</sub>-rich groundwaters of the Ardennes massif (Spa, Belgium)

Zinkgruvanite, Ba<sub>4</sub>Mn<sup>2+</sup><sub>4</sub>Fe<sup>3+</sup><sub>2</sub>(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>(SO<sub>4</sub>)<sub>2</sub>O<sub>2</sub>(OH)<sub>2</sub>, a new ericssonite-group mineral from the Zinkgruvan Zn-Pb-Ag-Cu deposit, Askersund, Örebro County, Sweden

Rotherkopfite, KNa<sub>2</sub>(Fe<sup>2+</sup><sub>2.5</sub>Ti<sup>4+</sup><sub>1.5</sub>) Fe<sup>2+</sup>(Si<sub>4</sub>O<sub>12</sub>)<sub>2</sub>, a new neptunite-group mineral without essential lithium, from Rother Kopf, Eifel volcanic fields, Germany

Igelströmite, Fe<sup>3+</sup>(Sb<sup>3+</sup>Pb<sup>2+</sup>) O<sub>4</sub>, and manganoschafarzikite, Mn<sup>2+</sup>Sb<sup>3+</sup><sub>2</sub>O<sub>4</sub>, two new members of the newly established minium group, from the Långban Mn–Fe deposit, Värmland, Sweden

Validation of a coupled <italic>δ</italic><sup>2</sup>H<sub><italic>n</italic>-alkane</sub>–<italic>δ</italic><sup>18</sup>O<sub>sugar</sub> paleohygrometer approach based on a climate chamber experiment

Manganrockbridgeite, Mn<sup>2+</sup><sub>2</sub>Fe<sup>3+</sup><sub>3</sub>(PO<sub>4</sub>)<sub>3</sub>(OH)<sub>4</sub>(H<sub>2</sub>O), a new member of the rockbridgeite group, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria

Reaction dynamics of P (<sup>4</sup>S) + O<sub>2</sub>(X <sup>3</sup>&Sigma;<sup>-</sup>) &rarr; O (<sup>3</sup>P) + PO (X <sup>2</sup>&Pi;) on a global CHIPR potential energy surface of PO<sub>2</sub>(X <sup>2</sup>A<sub>1</sub>): implication for atmospheric modelling

Quantification of fossil fuel CO<sub>2</sub> from combined CO, &delta;<sup>13</sup>CO<sub>2</sub> and &Delta;<sup>14</sup>CO<sub>2</sub> observations

Inter-comparison of online and offline methods for measuring ambient heavy and trace elements and water-soluble inorganic ions (NO<sub>3</sub><sup>−</sup>, SO<sub>4</sub><sup>2−</sup>, NH<sub>4</sub><sup>+</sup>, and Cl<sup>−</sup>) in PM<sub>2.5</sub> over a heavily polluted megacity, Delhi

<italic>δ</italic><sup>13</sup>C, CO<sub>2</sub>&thinsp;∕&thinsp;<sup>3</sup>He and <sup>3</sup>He&thinsp;∕&thinsp;<sup>4</sup>He ratios reveal the presence of mantle gas in the CO<sub>2</sub>-rich groundwaters of the Ardennes massif (Spa, Belgium)

Zinkgruvanite, Ba<sub>4</sub>Mn<sup>2+</sup><sub>4</sub>Fe<sup>3+</sup><sub>2</sub>(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>(SO<sub>4</sub>)<sub>2</sub>O<sub>2</sub>(OH)<sub>2</sub>, a new ericssonite-group mineral from the Zinkgruvan Zn-Pb-Ag-Cu deposit, Askersund, Örebro County, Sweden

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Reaction dynamics of P (<sup>4</sup>S) + O<sub>2</sub>(X <sup>3</sup>Σ<sup>-</sup>) → O (<sup>3</sup>P) + PO (X <sup>2</sup>Π) on a global CHIPR potential energy surface of PO<sub>2</sub>(X <sup>2</sup>A<sub>1</sub>): implication for atmospheric modelling

Quantification of fossil fuel CO<sub>2</sub> from combined CO, δ<sup>13</sup>CO<sub>2</sub> and Δ<sup>14</sup>CO<sub>2</sub> observations

<italic>δ</italic><sup>13</sup>C, CO<sub>2</sub> ∕ <sup>3</sup>He and <sup>3</sup>He ∕ <sup>4</sup>He ratios reveal the presence of mantle gas in the CO<sub>2</sub>-rich groundwaters of the Ardennes massif (Spa, Belgium)

Reaction dynamics of P (<sup>4</sup>S) + O<sub>2</sub>(X <sup>3</sup>Σ<sup>-</sup>) → O (<sup>3</sup>P) + PO (X <sup>2</sup>Π) on a global CHIPR potential energy surface of PO<sub>2</sub>(X <sup>2</sup>A<sub>1</sub>): implication for atmospheric modelling

Quantification of fossil fuel CO<sub>2</sub> from combined CO, δ<sup>13</sup>CO<sub>2</sub> and Δ<sup>14</sup>CO<sub>2</sub> observations

<italic>δ</italic><sup>13</sup>C, CO<sub>2</sub> ∕ <sup>3</sup>He and <sup>3</sup>He ∕ <sup>4</sup>He ratios reveal the presence of mantle gas in the CO<sub>2</sub>-rich groundwaters of the Ardennes massif (Spa, Belgium)

Reaction dynamics of P (<sup>4</sup>S) + O<sub>2</sub>(X <sup>3</sup>Σ<sup>-</sup>) → O (<sup>3</sup>P) + PO (X <sup>2</sup>Π) on a global CHIPR potential energy surface of PO<sub>2</sub>(X <sup>2</sup>A<sub>1</sub>): implication for atmospheric modelling

Quantification of fossil fuel CO<sub>2</sub> from combined CO, δ<sup>13</sup>CO<sub>2</sub> and Δ<sup>14</sup>CO<sub>2</sub> observations

<italic>δ</italic><sup>13</sup>C, CO<sub>2</sub> ∕ <sup>3</sup>He and <sup>3</sup>He ∕ <sup>4</sup>He ratios reveal the presence of mantle gas in the CO<sub>2</sub>-rich groundwaters of the Ardennes massif (Spa, Belgium)