A new nomenclature scheme for the alluaudite supergroup

Hatert, Frédéric

doi:10.1127/ejm/2019/0031-2874

Cited by 23 publications

(34 citation statements)

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“…Although from a didactical and historical viewpoint it is practical to classify mineral species first into classes, this approach seems to be inconsistent with the present list of the supergroups, either approved by the IMA-CNMNC or established following Mills et al [6]: alluaudite [25], alunite [26], amphibole [5], apatite [27], arctite [28], astrophyllite [29], betpakdalite [30], brackebuschite [31], dumortierite [32], epidote [33], gadolinite [34], garnet [9], gatelite [35], högbomite [36], hollandite [37], hydrotalcite [38], labuntsovite [39], laueite [40], lindackerite [41], lovozerite [42], mayenite [43], perovskite [44], pharmacosiderite [45], pyrochlore [23], sapphirine [46], seidozerite [47], spinel [4], tobermorite [48], and tourmaline [21]. We can note that 15 out of the 29 approved supergroups (hence more than 50%) include mineral species with different anions or anionic complexes: alunite, apatite, arctite, brackebuschite, dumortierite, gadolinite, garnet, hydrotalcite, mayenite, perovskite, pharmacosiderite, sapphirine, seidozerite, spinel, and tourmaline.…”

Section: One Note On the Mineral Classification Schemementioning

confidence: 99%

On the Chemical Identification and Classification of Minerals

2019

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To univocally identify mineral species on the basis of their formula, the IMA-CNMNC recommends the use of the dominant-valency rule and/or the site-total-charge approach, which can be considered two procedures complementary to each other for mineral identification. In this regard, several worked examples are provided in this study along with some simple suggestions for a more consistent terminology and a straightforward use of mineral formulae. IMA-CNMNC guidelines subordinate the mineral structure to the mineral chemistry in the hierarchical scheme adopted for classification. Indeed, a contradiction appears when we first classify mineral species to form classes (based on their chemistry) and subsequently we group together them to form supergroups (based on their structure topology): To date, more than half of recognized mineral supergroups include species with different anions or anionic complexes. This observation is in contrast to the current use of chemical composition as the distinguishing factor at the highest level of mineral classification.

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Section: One Note On the Mineral Classification Schemementioning

confidence: 99%

On the Chemical Identification and Classification of Minerals

2019

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“…The crystal structure of badalovite ( Fig. 5a), like structures of other members of the alluaudite group (Moore, 1971;Moore and Ito, 1979;Krivovichev et al, 2013;Hatert, (Fig. 5b) and the fourth vertex with the octahedron of adjacent layer, thus linking the layers to a three-dimensional Table 3.…”

Section: Discussionmentioning

confidence: 90%

“…Different coloured samples of badalovite were found to have close chemical composition ( (Hatert, 2019), is NaNaMg(MgFe 3+ ) (AsO 4 ) 3 .…”

Section: Chemical Compositionmentioning

confidence: 99%

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New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XIV. Badalovite, NaNaMg(MgFe³⁺)(AsO₄)₃, a member of the alluaudite group

Pekov

Koshlyakova

Agakhanov

et al. 2020

MinMag

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Abstract The new alluaudite-group mineral badalovite was found in the Arsenatnaya fumarole at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It is associated with hematite, tenorite, cassiterite, johillerite, nickenichite, calciojohillerite, bradaczekite, metathénardite, aphthitalite, langbeinite, calciolangbeinite, sanidine, fluorophlogopite, fluoborite, tilasite, anhydrite, pseudobrookite, sylvite, halite, lammerite, urusovite, ericlaxmanite, arsmirandite, svabite, krasheninnikovite, euchlorine, wulffite and alumoklyuchevskite. Badalovite forms oblique-angled prismatic crystals up to 1 mm × 1 mm × 5 mm, typically combined in groups or crusts up to several hundred cm2 in area. The mineral is transparent, green, grey, yellow or colourless, with vitreous lustre. It is brittle, the Mohs hardness is 3½. Cleavage was not observed, the fracture is uneven. Dcalc is 4.02 g cm–3. Badalovite is optically biaxial (–), α = 1.753(3), β = 1.757(3), γ = 1.758(3) and 2Vmeas. = 50(10)°. Chemical composition (wt.%, electron-microprobe; holotype) is: Na2O 9.23, K2O 0.19, CaO 2.04, MgO 13.78, MnO 0.31, CuO 0.12, ZnO 0.24, Al2O3 0.06, Fe2O3 12.77, TiO2 0.01, SiO2 0.06, P2O5 0.33, V2O5 0.05, As2O5 61.51, SO3 0.02, total 100.72. The empirical formula based on 12 O apfu is Na1.67Ca0.20K0.02Mg1.92Zn0.02Mn0.02Cu0.01Fe3+0.90Al0.01(As3.01P0.03Si0.01)Σ3.05O12. The simplified formula is Na2Mg2Fe3+(AsO4)3. Badalovite is monoclinic, C2/c, a = 11.9034(3), b = 12.7832(2), c = 6.66340(16) Å, β = 112.523(3)°, V = 936.59(4) Å3 and Z = 4. The strongest reflections of the powder XRD pattern [d,Å(I)(hkl)] are: 6.41(38)(020), 5.505(20)(200), 3.577(23)( $\bar{1}$ 31), 3.523(25)(310), 3.211(46)( $\bar{1}$ 12), 2.911(28)( $\bar{2}$ 22, $\bar{3}$ 12), 2.765(100)(240, 400) and 2.618(26)( $\bar{1}$ 32). The crystal structure was solved from single-crystal XRD data with an R1 of = 2.49%. Badalovite is isostructural with other alluaudite-group minerals. Its simplified crystal chemical formula is A (1)Na A (1)’□ A (2) □ A (2)’Na M (1)Mg M (2)(Mg0.5Fe3+0.5)2(AsO4)3 (□ – vacancy) and the end-member formula is NaNaMg(MgFe3+)(AsO4)3. The mineral is named in honour of the outstanding mineralogist and geochemist Stepan Tigranovich Badalov (1919–2014).

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“…Moore and Ito (1979) introduced a nomenclature for the minerals of the alluaudite and wyllieite groups. Recently, a new nomenclature of the alluaudite supergroup, which contains totally 16 phosphate and 19 arsenate minerals by 2019, has been presented by Hatert (2019). Khorari et al (1997) examined the compositional relations between the alluaudite and garnet structures and revealed that the alluaudite structure, like the garnet structure, is extremely chemically compliant.…”

Section: Introductionmentioning

confidence: 99%

Zhanghuifenite, Na3Mn42+Mg2Al(PO4)6, a new mineral isostructural with bobfergusonite, from the Santa Ana mine, San Luis province, Argentina

Yang

Kobsch

et al. 2021

American Mineralogist

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A new mineral species, zhanghuifenite, ideally Na 3 Mn 2+ 4 Mg 2 Al(PO 4) 6 , has been 18 found in the Santa Ana mine, San Luis province, Argentina. It occurs in irregular veinlets 19 or patches, 5 mm thick, in a nodule of beusite interlaminated with lithiophilite. Broken 20 pieces of zhanghuifenite are blocky or tabular. Single crystals are up to 0.8 x 0.5 x 0.5 21 mm. No twinning or parting is observed macroscopically. The mineral is deep green, 22 transparent with pale green streak and vitreous luster. It is brittle and has a Mohs 23 hardness of ~5 with good cleavage on {010}. The measured and calculated densities are 24 3.63(2) and 3.62 g/cm 3 , respectively. Optically, zhanghuifenite is biaxial (+), with α = 25 1.675 (2), β = 1.680 (2), γ = 1.690 (2) (white light), 2V (meas.) = 74(2)º, and 2V (calc.) = 26 71º. The calculated compatibility index based on the empirical formula is 0.020 27 (excellent). An electron microprobe analysis yields an empirical formula (based on 24 O 28 apfu) 29 (Na 2.80 Ca 0.11) Σ2.91 (Mn 2+ 3.09 Fe 2+ 0.47 Mg 0.36) Σ3.92 (Mg 1.31 Fe 2+ 0.69) Σ2.00 (Al 0.81 Fe 3+ 0.19)(PO 4) 6. 30 Zhanghuifenite is insoluble in water or hydrochloric acid. 31 This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America. The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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A new nomenclature scheme for the alluaudite supergroup

Cited by 23 publications

References 41 publications

On the Chemical Identification and Classification of Minerals

On the Chemical Identification and Classification of Minerals

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XIV. Badalovite, NaNaMg(MgFe³⁺)(AsO₄)₃, a member of the alluaudite group

Zhanghuifenite, Na3Mn42+Mg2Al(PO4)6, a new mineral isostructural with bobfergusonite, from the Santa Ana mine, San Luis province, Argentina

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A new nomenclature scheme for the alluaudite supergroup

Cited by 23 publications

References 41 publications

On the Chemical Identification and Classification of Minerals

On the Chemical Identification and Classification of Minerals

New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XIV. Badalovite, NaNaMg(MgFe3+)(AsO4)3, a member of the alluaudite group

Zhanghuifenite, Na3Mn42+Mg2Al(PO4)6, a new mineral isostructural with bobfergusonite, from the Santa Ana mine, San Luis province, Argentina

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New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XIV. Badalovite, NaNaMg(MgFe³⁺)(AsO₄)₃, a member of the alluaudite group