Multi-analytical approach to solve the puzzle of an allanite-subgroup mineral from Kesebol, Vastra Gotaland, Sweden

Bonazzi, Paola; Holtstam, Dan; Bindi, Luca; Nysten, Per; Capitani, Giancarlo

doi:10.2138/am.2009.2998

Cited by 20 publications

(15 citation statements)

References 24 publications

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“…The result of structural refinement of YTT allanite suggests that a small amount of Fe 3+ is incorporated in M2 (Table 4). This incorporation corresponds to the crystal structures of annealed allanites refined by Bonazzi and Menchetti (1994) and Bonazzi et al (2009).…”

Section: Structure Refinementsupporting

confidence: 72%

“…Following the previous studies of epidote-group minerals (Dollase 1971;Kartashov et al 2002;Hoshino et al 2008: Bonazzi et al 2009), the structure refinement of YTT allanite was done with Si assigned only to tetrahedral sites. According to Armbruster et al (2006), if Si<3.00 apfu , 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 9 Al is incorporated into the Si3 site.…”

Section: Structure Refinementmentioning

confidence: 99%

“…On the basis of the representative EMPA data (Table 1), (Ca+ Fe + Mn) were assigned to the A1 site, and (La + Ce + Pr + Nd + Sm + Th + Ca) to the A2 site (Tables 4 and 5). The smallest M2 octahedron has a strong preference for Al, whereas the occupancy of M1 and M3 depends on competing ions, with the cations of larger ionic radii mainly ordered on the larger M3 octahedron (e.g., Bonazzi et al 2009). According to Bonazzi and Menchetti (1994), M2 in annealed allanite shows a lesser Fe 3+ incorporation, while M2 in untreated one is only occupied by Al.…”

Section: Structure Refinementmentioning

confidence: 99%

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Crystal chemistry of volcanic allanites indicative of naturally induced oxidation-dehydrogenation

et al. 2009

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Section: Structure Refinementsupporting

confidence: 72%

Section: Structure Refinementmentioning

confidence: 99%

Section: Structure Refinementmentioning

confidence: 99%

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Crystal chemistry of volcanic allanites indicative of naturally induced oxidation-dehydrogenation

et al. 2009

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“…The first "akasakaite" to have been described was ferriakasakaite-(La) from a stratiform Fe-Mn ore deposit in the Shobu area, Ise City, Mie Prefecture (Japan) [2]. Actually, Cenki-Tok et al [10] found an allanite group mineral having end-member formula CaREEAlAlMn 2+ (Si 2 O 7 )(SiO 4 )O(OH), and Bonazzi et al [39] studied a specimen from Kesebol (Sweden), corresponding to ferriakasakaite-(Ce), without proposing it as a new mineral species to the IMA-CNMNC. Following the first official description of an "akasakaite" by Nagashima et al [2], Chukanov et al [22] reported new occurrences of this mineral from the Laach Lake volcanic complex, Eifel (Germany) and the Pelagonian massif (Republic of North Macedonia).…”

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confidence: 99%

Manganiakasakaite-(La) and Ferriakasakaite-(Ce), Two New Epidote Supergroup Minerals from Piedmont, Italy

et al. 2019

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Two new monoclinic (P2 1 /m) epidote supergroup minerals manganiakasakaite-(La) and ferriakasakaite-(Ce) were found in the small Mn ore deposit of Monte Maniglia, Bellino, Varaita Valley, Cuneo Province, Piedmont, Italy. Manganiakasakaite-(La) occurs as subhedral grains embedded in pyroxmangite. Its empirical formula is A(1) (Ca 0.62 Mn 2+ 0.38 ) A(2) (La 0.52 Nd 0.08 Pr 0.07 Ce 0.07 Y 0.01 Ca 0.25 ) M(1) (Mn 3+ 0.52 Fe 3+ 0.28 Al 0.18 V 3+ 0.01 ) M(2) Al 1.00 M(3) (Mn 2+ 0.60 Mn 3+ 0.27 Mg 0.13 ) T(1−3) (Si 2.99 Al 0.01 ) O 12 (OH), corresponding to the end-member formula CaLaMn 3+ AlMn 2+ (Si 2 O 7 )(SiO 4 )O(OH). Unit-cell parameters are a = 8.9057(10), b = 5.7294(6), c = 10.1134(11) Å, β = 113.713(5) • , V = 472.46(9) Å 3 , Z = 2. The crystal structure of manganiakasakaite-(La) was refined to a final R 1 = 0.0262 for 2119 reflections with F o > 4σ(F o ) and 125 refined parameters. Ferriakasakaite-(Ce) occurs as small homogeneous domains within strongly inhomogeneous prismatic crystals, where other epidote supergroup minerals coexist [manganiandrosite-(Ce), "androsite-(Ce)", and epidote]. Associated minerals are calcite and hematite. Its empirical formula is A(1) (Ca 0.64 Mn 2+ 0.36 ) A(2) (Ce 0.37 La 0.17 Nd 0.06 Pr 0.03 Ca 0.35 0.02 ) M(1) (Fe 3+ 0.61 Al 0.39 ) M(2) Al 1.00 M(3) (Mn 2+ 0.64 Mn 3+ 0.33 Fe 3+ 0.02 Mg 0.01 ) T(1−3) Si 3.01 O 12 (OH), the end-member formula being CaCeFe 3+ AlMn 2+ (Si 2 O 7 )(SiO 4 )O(OH). Unit-cell parameters are a= 8.9033(3), b = 5.7066(2), c = 10.1363(3) Å, β = 114.222(2) • , V = 469.66(3) Å 3 , Z = 2. The crystal structure of ferriakasakaite-(Ce) was refined to a final R 1 = 0.0196 for 1960 unique reflections with F o > 4σ(F o ) and 124 refined parameters. Minerals 2019, 9, 353 2 of 15and 2 to the dollaseite group. Two additional minerals stand alone: zoisite, the unique example of epidote with orthorhombic symmetry, and åskagenite-(Nd), the unique example of epidote having a divalent anion dominant at the O(10) site. We herewith describe manganiakasakaite-(La) and ferriakasakaite-(Ce), two new minerals belonging to the allanite group. In this group, a trivalent cation, typically a REE, is dominant at the A(2) site, and a divalent cation is dominant at the M(3) site. According to the general guidelines for the nomenclature of epidotes [1], each distinct combination of dominant cations at the A(1) and M(3) sites deserves a proper root-name. In particular, the root-name "akasakaite" (after Masahide Akasaka, professor of mineralogy at the Shimane University) corresponds to the pair A(1) = Ca and M(3) = Mn 2+ [2]. Then, an adjectival prefix is appended to the root-name for the dominant cation at the M(1) (other than Al), and a Levinson suffix [3] is appended to the root-name for the dominant REE at the A(2) site. The names of the two new minerals are in keeping with the above guidelines, as they represent chemical variants of the mineral ferriakasakaite-(La), which was first described from Japan [2]. Both manganiakasakaite-(La) and ferriakasakaite-(Ce) were found in the Mn ore d...

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“…Epidote and allanite are the most commonly reported epidote-group minerals. Because the epidote-group minerals are chemically very complex (e.g., Ercit, 2002), a rigorous nomenclature has only recently been proposed (Armbruster et al, 2006) with suggested modifications (i.e., Bonazzi et al, 2009 (Armbruster et al, 2006). Allanite is the most common epidote-group mineral hosting Rare Earth Elements (REE) and is defined as containing REE + Actinides N 0.5 apfu (Armbruster et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Predicting radioactive accessory mineral dissolution during chemical weathering: The radiation dose at the solubility threshold for epidote-group detrital grains from the Yangtze River delta, China

Price¹,

Wilton²,

Tubrett³

et al. 2015

Chemical Geology

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Multi-analytical approach to solve the puzzle of an allanite-subgroup mineral from Kesebol, Vastra Gotaland, Sweden

Cited by 20 publications

References 24 publications

Crystal chemistry of volcanic allanites indicative of naturally induced oxidation-dehydrogenation

Crystal chemistry of volcanic allanites indicative of naturally induced oxidation-dehydrogenation

Manganiakasakaite-(La) and Ferriakasakaite-(Ce), Two New Epidote Supergroup Minerals from Piedmont, Italy

Predicting radioactive accessory mineral dissolution during chemical weathering: The radiation dose at the solubility threshold for epidote-group detrital grains from the Yangtze River delta, China

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