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Arsenoflorencite-(La) [Aρcehπορehcht-(La)], ideally LaAl3(AsO4)2(OH)6, is a new mineral (IMA2009–078), from the Grubependity Lake cirque, Maldynyrd range, upper Kozhim River basin, Prepolar Ural, Komi Republic, Russia. It occurs in direct association with zircon, quartz, hematite, ardennite-(As), andalusite, anorthite, sericite, clinochlore, chern...
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Context 1
... illustration of the last factor is provided by the arseno- florencite-(La)-chernovite-(Y) pair from different grains of our specimen (Table 7 and Fig. 4). The highest concentra- tions of Nd are observed in arsenoflorencite-(La) grains devoid of chernovite-(Y) inclusions. ...
Context 2
... of arsenoflorencite-(La) exhausted the reserve of LREE in solution, resulting in an increase in concentration of HREE. As a result, the REE minerals formed later than arsenoflorencite-(La) within the parage- netic sequence are enriched with intermediate and heavy REE ( Table 7, analysis 8). Analysis 1: grain of arsenoflorencite-(La) without inclusions of chernovite-(Y) (Fig. 3a); analyses 2-3, 4-5 and 6-7 are of arsenoflorencite- (La) (2, 4, 6) with inclusions of chernovite-(Y) (3, 5, 7) ( Fig. 3b-d, respectively); analysis 8 is of later-generation chernovite-(Y) (Fig. 3d) ...
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Citations
... Тогда же в турмалинитах месторождения горного хрусталя Пирамида были обнаружены кристаллы гояцита, содержащие ядра-затравки флоренсита (Репина и др., 2005). Открытие и изучение месторождения Au-Pd-REE Чудное сопровождалось многочисленными находками редких минералов, среди которых впервые были описаны минералы из серий флоренсита и арсенофлоренсита (Моралев и др., 2005;Репина, Юзеева и др., 2005;Mills et al., 2010;Репина и др. 2010, 2011. ...
Crandallite and Florensite-(Ce) from a Quartz Vein of the Area Zhelannoye Deposit (Subpolar Ural)
The article displays data on minerals of the plumbogummite group – crandallite and florencite-(Ce). Minerals were found on a fragment of a hematite aggregate recovered from the lower pinch out of a quartz vein of the Zone 25 occurrence. It is situated in close neighborhood to the known Zhelannoye deposit of vein quartz and rock crystals and the Au-Pd-REE ore deposit Chudnoye. Crandallite segregations are represented by two forms: rhombohedral crystals and spherulites. There are distinguished three generations of crandallite: the first
one represented by rhombohedral crystals, the second – by crusts on the rhombohedron faces, the third – crandallite spherulites on the surface of rhombohedrons. The crusts, 150 μm thick, consist of four layers: REE-bearing crandallite, symplectite intergrowths of crandallite with florensite-(Ce), spherulites, and powdering of crandallite crystals. The first and second generations of the mineral were crystallized from solutions, the third resulted the redeposition. There are varying contents of Sr, Ba, REE, U, Fe, S, and Si admixtures in crandallite of different types.
... Cervandone (Italy) and adjacent Binn Valley (Switzerland). For a complete overview about the sites where gasparite-(Ce) occurs, refer to Ondrejka et al. (2007), Anthony et al. (2000), , Mills et al. (2010), Mancini (2000), Vereshchagin et al. (2019), Cabella et al. (1999). ...
The high-pressure behavior of the natural arsenate gasparite-(Ce) [Ce0.43La0.24Nd0.15Ca0.11Pr0.04Sm0.02Gd0.01(As0.99Si0.03O4)] from the Mt. Cervandone mineral deposit (Piedmont Lepontine Alps, Italy), has been studied by in situ single-crystal synchrotron X-ray diffraction up to 22.01 GPa. Two distinct high-pressure ramps have been performed, using a 16:3:1 methanol:ethanol:water solution and helium as P-transmitting fluids, respectively. No phase transition occurs within the pressure range investigated, whereas a change in the compressional behavior has been observed at ~ 15 GPa. A second-order Birch-Murnaghan EoS was fitted to the P-V data, leading to a refined bulk modulus of 109.4(3) GPa. The structural analysis has been carried out on the basis of the refined structure models, allowing the description of the deformation mechanisms accommodating the bulk compression in gasparite-(Ce) at the atomic scale, which is mainly controlled by the compression of the Rare Earth Elements coordination polyhedra, while the AsO4 tetrahedra behave as a quasi-rigid units. A micro-Raman spectroscopy analysis, performed at ambient conditions, suggests the presence of hydroxyl groups into the structure of the investigated gasparite-(Ce).
... Hardness and density were not measured, owing to the small size of available crystals. Mohs hardness was estimated to be ∼ 3.5, in agreement with other alunite super- group minerals (e.g., Mills et al., 2010). As will be discussed below, crystals of graulichite-(La) are chemically inhomogeneous and the calculated density for the two observed homogeneous domains are 3.907 and 3.962 g cm −3 for domain #1 and #2, respectively. ...
... The A site shows an average bond distance of 2.78 Å, to be compared with 2.74 Å reported by Hatert et al. (2003) for graulichite-(Ce) and 2.682 Å observed by Mills et al. (2010) in arsenoflorencite-(La). Crystal structure refinement indicates a site scattering value corresponding to ∼ 54 electrons per formula unit (epfu). ...
The new mineral species graulichite-(La), ideally
LaFe33+(AsO4)2(OH)6, has been discovered in the
Patte d'Oie mine, Bou Skour mining district, Morocco. It occurs as yellow
rhombohedral crystals, up to 0.1 mm in size, with a resinous luster,
associated with malachite, agardite-(La), conichalcite, and a still
undetermined REE carbonate. Crystals are chemically zoned and two
homogeneous domains were identified, corresponding to the empirical chemical
formulae (calculated on the basis of 6 cations per formula unit, assuming
the occurrence of 14 O atoms)
(La0.34Ce0.20Ca0.11Sr0.07Pb0.05K0.04)Σ0.81(Fe2.163+Al0.84Cu0.20)Σ3.20(As1.23P0.39S0.37)Σ1.99O14H6.13
(domain #1) and
(La0.38Ce0.22Sr0.10Ca0.09Pb0.05K0.06)Σ0.90(Fe2.603+Al0.49Cu0.20)Σ3.29(As0.91P0.50S0.40)Σ1.81O14H6.53
(domain #2). Single-crystal unit-cell parameters are a=7.252(13), c=16.77(3) Å, V=764(3) Å3, space group R-3m. The eight strongest
reflections in the observed X-ray powder diffraction pattern are (d in Å,
visually estimated intensity): 5.86, medium; 3.045, strong; 2.511,
medium-weak; 2.239, medium; 1.960, medium-weak; 1.813, medium-weak; 1.689,
medium-weak; 1.478, medium. Graulichite-(La) belongs to the dussertite group
within the alunite supergroup. It is the La analogue of graulichite-(Ce) and
the Fe3+ analogue of arsenoflorencite-(La).
... Более высокие (0.293 аф) обнаружены в Nb-содержащем черновите-(Y) [12]. В большенстве же образцов легкие РЗЭ не были обнаружены или их содержание было ниже 0.2 аф [3,9,11,[13][14][15]. Нами не обсуждаются результаты анализов черновита-(Y) [10], поскольку они неудовлетворительно пересчитываются на формулу АВО 4 , так как сумма атомов в позициях А и В значительно превышает 2. Лишь в одном анализе черновита-(Y) было установлено более высокое содержание легких РЗЭ -0.41 аф [11]. ...
... Ранее Се (до 0.02) в этом минерале был установлен только в образце из Тисовец-Рейково [12]. В изученном образце выявлен Р, но его содержания (0.1 атом) значительно ниже, чем в черновите-(Y) из других мест [3,9,11,12,14,15]. В изученном черновите-(Y) присутствует фтор, ранее обнаруженный в минерале из онгонитов на Дальнем Востоке, Россия [15]. ...
... Comparison with chemical data reported in the literature A comparison with the composition of chernovite-(Y) from Mt. Cervandone and that from the Binn Valley, reported by Graeser et al. (1973), shows a P and As content very close to that reported in Table 2 for our samples, resulting in As/(As+P) = 0.76 and 0.84, respectively. A comparison with published chemical analyses of chernovite-(Y) and xenotime-(Y) occurring in different localities (Ondrejka et al., 2007;Förster et al., 2011;Breiter et al., 2009;Li et al., 2019;Alekseev and Marin, 2013;Kerbey, 2013;Mills et al., 2010;Papoutsa and Pe-Piper, 2014) shows that the zircon-type phosphates and arsenates investigated here selectively host HREE, with a very low LREE content. In Fig. 9, the HREE vs. LREE content of several xenotime-(Y) and chernovite-(Y) samples from different geological environments is reported, including crystals from hydrothermally-altered A-type granites, rhyolites, pegmatites (Ondrejka et al., 2007;Breiter et al., 2009;Li et al., 2019;Papoutsa and Pe-Piper, 2014;Förster et al., 2011) and Mn nodules contained in metasedimentary rocks (Mills et al., 2010). ...
... A comparison with published chemical analyses of chernovite-(Y) and xenotime-(Y) occurring in different localities (Ondrejka et al., 2007;Förster et al., 2011;Breiter et al., 2009;Li et al., 2019;Alekseev and Marin, 2013;Kerbey, 2013;Mills et al., 2010;Papoutsa and Pe-Piper, 2014) shows that the zircon-type phosphates and arsenates investigated here selectively host HREE, with a very low LREE content. In Fig. 9, the HREE vs. LREE content of several xenotime-(Y) and chernovite-(Y) samples from different geological environments is reported, including crystals from hydrothermally-altered A-type granites, rhyolites, pegmatites (Ondrejka et al., 2007;Breiter et al., 2009;Li et al., 2019;Papoutsa and Pe-Piper, 2014;Förster et al., 2011) and Mn nodules contained in metasedimentary rocks (Mills et al., 2010). From Fig. 9, the majority of the chernovite-(Y)-xenotime-(Y) samples from Mt. Cervandone are mostly enriched in HREE, and only in the outer domains of Ch11 (Ch11 c and Ch11 d ) is the fraction of LREE high (reaching Table 3. Unit-cell parameters of all the samples under investigation. ...
The crystal chemistry and crystal structure of the rare earth element phosphates, monazite-(Ce), Ce(PO 4 ), and xenotime-(Y), Y(PO 4 ), as well as the arsenates, gasparite-(Ce), Ce(AsO 4 ), and chernovite-(Y), Y(AsO 4 ), from the hydrothermal quartz-bearing fissures, related to pegmatites overprinted by amphibolite facies, cropping out at Mt. Cervandone, Western Alps, Piedmont, Italy, have been investigated by means of electron microprobe analysis in wavelength dispersion mode and single-crystal X-ray diffraction. The chemical data reveal the occurrence of a full solid solution among the isostructural chernovite-(Y) and xenotime-(Y) with tetragonal symmetry, whereas a wide miscibility gap is observed for the isostructural gasparite-(Ce) and monazite-(Ce) of Mt. Cervandone, with monoclinic symmetry. A significant chemical heterogeneity has been observed for several investigated samples, especially related to the Th content, which is locally enriched in ThSiO 4 grains. The analysis of the refined structural models demonstrates the significant control played by the composition of the tetrahedrally-coordinated (As,P)-bearing sites on the bulk unit-cell volume, and on the size and shape of the (REE)-coordination polyhedra.
... арсенаты и 1 иттриевый арсенат. Гаспарит-La и -Ce наиболее типичны для постмагматической минерализации, связанной с редкометалльными гранитами и грейзенами, гранит-порфирами и риолитами (Рудные горы Германии, Чехии, Западные Карпаты), метаморфических пород Швейцарских и Итальянских Альп [18,19,22,24,25,28], а также Fe-Mn руд (Казахстан, Итальянские Альпы и др.) [28]. Черновит-Y обнаружен в жилах альпийского типа в Швейцарских Альпах, редкометалльных гранитах Рудных гор, а также в риолитах Приполярного Урала и Li-F гранитах Дальнего Востока [1,3,13,21,23,26]. ...
Rare minerals represented by oxides, fluorides, F-carbonates and REE arsenates associated with monazite-Ce, monazite-Th, xenothym-Y and REE zonal fluorite were identified in rare-metal ores of the Sn-W deposits of the Malyi Khingan in Priamurye. Rare lanthanide minerals are described, such as fluocerite, bastnesite, gasparite-Ce, first found in Russia in Sn-W greisens, and chernovite-Y, which is the second find in the greisens of the Russian Far East. The processes of sequential replacement of xenothyme-Y and monazite-Ce by arsenic fluids in the late hydrothermal stage with the formation of various REE minerals with different lanthanide ratios are shown, and the difference is revealed in their chemical composition from that of the previously described similar minerals in other deposits of the world. Due to the different valence of arsenic and the unlimited isomorphism of rare earths, arsenates can be used as indicators of redox conditions of their deposition.
... Более высокие (0.293 аф) обнаружены в Nb-содержащем черновите-(Y) [12]. В большенстве же образцов легкие РЗЭ не были обнаружены или их содержание было ниже 0.2 аф [3,9,11,[13][14][15]. Нами не обсуждаются результаты анализов черновита-(Y) [10], поскольку они неудовлетворительно пересчитываются на формулу АВО 4 , так как сумма атомов в позициях А и В значительно превышает 2. Лишь в одном анализе черновита-(Y) было установлено более высокое содержание легких РЗЭ -0.41 аф [11]. ...
... Ранее Се (до 0.02) в этом минерале был установлен только в образце из Тисовец-Рейково [12]. В изученном образце выявлен Р, но его содержания (0.1 атом) значительно ниже, чем в черновите-(Y) из других мест [3,9,11,12,14,15]. В изученном черновите-(Y) присутствует фтор, ранее обнаруженный в минерале из онгонитов на Дальнем Востоке, Россия [15]. ...
... All three REE arsenates occur in metasomatic rocks of the Maldinskoe Au-Pd-REE ore field. It was this locality where arsenoflorencite-(La) was first found (Moralev et al., 2005;Mills et al., 2010). ...
REE fractionation into cerium Ce g (La-Eu) and yttrium Y g (Gd-Lu) groups, as well as La sg (La-Pr), Sm sg (Nd-Eu), Gd sg (Gd-Dy), and Yb sg (Y, Ho-Lu) subgroups in xenotime and florencite crystals from the ore occurrence, Polar Urals, is considered. REE subgroups and other minor elements of the minerals form isomorphic complexes, among which are)О 4 ] in xenotime. The paper discusses the distribution of these complexes in zones of crystal growth and in the volume of crystals. The chemical compositions of simple forms of crystals are compared-namely, bipyramids and prisms of xenotime, as well as several rhombohedra of florencite. Mineral inclusions with the same compositions as xenotime and florencite hosting them are characterized and the reasons for their appearance are considered. Based on the sequence of the formation of minerals, evidence is provided for regular trends in lanthanide composition of phosphates upon their crystal-lization (increasing role off light lanthanides relative to heavy lanthanides). The mechanisms of crystal growth are investigated, including relative linear and volume growth rates of crystal faces, the formation of co-growth surfaces of different faces and individuals, and the nature of oscillatory and trend zoning. The existence of the tetrad effect in the lanthanide compositions of two minerals is verified.
... Все три редкоземельных арсената встречаются в метасоматитах Малдинского Au-Pd-REE рудного поля. Именно здесь впервые был найден арсенофлоренсит-(La) (Моралёв и др., 2005;Mills et al., 2010). ...
Рассмотрены особенности фракционирования редкоземельных элементов на груп-
пы – цериевую Сеg (La–Eu) и иттриевую Yg (Gd–Lu) и на подгруппы – Lasg (La–Pr),
Smsg (Nd–Eu), Gdsg (Gd–Dy), Ybsg (Y, Но–Lu) в кристаллах ксенотима и флоренсита
из рудопроявления Полярного Урала. Подгруппы редких земель вместе с другими
элементами, входящими в состав минералов, образуют изоморфные комплексы: во
флоренсите – Laк [(La,Се,Pr)Al3(P,As,Si)2O8(OH)6] и Smк
[(Nd,Sm,Eu,Gd,Sr,Ca)Al3(P,S,Si)2O8(OH)6], в ксенотиме – Gdк
[(Gd,Sm,Eu,Tb,Dy)(Р,Si)O4] и Ybк [(Y,Nd,Ho,Er,Yb,Lu,Sc,U)(Р,Аs,Si)О4]. В статье
анализируется распределение изоморфных комплексов по зонам роста граней и в
объеме кристаллов. Сравниваются химические составы простых форм: дипирамиды
и призмы кристалла ксенотима и нескольких форм ромбоэдров кристаллов флорен-
сита. Дана характеристика включений в ксенотиме и флоренсите, аналогичных по
составу вмещающим их фосфатам, рассматриваются причины их появления. На ос-
новании определения последовательности выделения минералов приводятся дока-
зательства закономерного изменения редкоземельного состава фосфатов в ходе их
кристаллизации (увеличения роли легких лантаноидов относительно тяжелых). Об-
суждаются механизмы роста кристаллов: относительные линейные и объемные ско-
рости роста граней, образование поверхностей совместного роста разных граней и
индивидов, природа осцилляционной и трендовой зональностей. Подтверждается
существование тетрадного эффекта в редкоземельных составах двух минералов.
... REE-arsenates are among rare minerals: CNMNC IMA has approved only 14 mineral species to date. Most of them are representative of Ce-dominant species, and only three Ladominant minerals have been discovered (Modresky 1983;Dunn et al. 1984;Mills et al. 2010). ...
... Cervandone, a summit on the frontier of Italy (Cervandone, Val Devero) and Switzerland (Wanni glacier, Binntal), where it occurs in metasedimentary rocks (Graeser and Schwander 1987). Besides that, gasparite-(Ce) was found as an accessory mineral in the Black Range Tin District, New Mexico, U.S.A. (Foord et al. 1991(Foord et al. , 1999; Tisovec-Rejkovo, Slovakia (Ondrejka et al. 2007); Beryllium Virgin Claim, New Mexico, U.S.A. (Anthony et al. 2000); Chudnoe and Nesterovskoe occurrences, Maldynyrd Range, Prepolar Ural, Russia (Moralev et al. 2005); Kesebol deposit, Sweden ; Grubependity Lake cirque, Maldynyrd Range, Prepolar Ural, Russia (Mills et al. 2010); Artana, Carrara, Apuane Alps, Italy (Mancini 2000); Tanatz Alp, Switzerland (Roth and Meisser 2013), and Ponte dei Gonazzi, the Maritime Alps, Italy (Cabella et al. 1999). ...
Gasparite-(La), La(AsO 4), is a new mineral (IMA 2018-079) from Mn ores of the Ushkatyn-III deposit, Central Kazakhstan (type locality) and from alpine fissures in metamorphic rocks of the Wanni glacier, Binn Valley, Switzerland (co-type locality). Gasparite-(La) is named for its dominant lanthanide, according to current nomenclature of rare-earth minerals. The occurrences and parageneses in both localities are distinct: minute isometric grains up to 15 μm in size, associated with friedelite, jacobsite, pennantite, manganhumite series minerals (alleghanyite, sonolite), sarkinite, tilasite, and retzian-(La) are typically embedded into calcite-rhodochrosite veinlets (Ushkatyn-III deposit) vs. elongated crystals up to 2 mm in size in classical alpine fissures in two-mica gneiss without indicative associated minerals (Wanni glacier). Their chemical compositions have been studied by EDX and WDX; crystal-chemical formulas of gasparite-(La) from the Ushkatyn-III deposit (holotype specimen) and Wanni glacier (co-type specimen) are (La 0. ], respectively. In polished sections, crystals are yellow and translucent with bright submetallic luster. Selected reflectance values R 1 /R 2 (λ, nm) for the holotype specimen in air are: 11.19/9.05 (400), 11.45/9.44 (500), 10.85/8.81 (600), 11.23/9.08 (700). The structural characteristics of gasparite-(La) were studied by means of EBSD (holotype specimen), XRD, and SREF (co-type specimen). Gasparite-(La) has a monoclinic structure with the space group P2 1 /n. Our studies revealed that gasparite-(La) from the Ushkatyn-III deposit and Wanni glacier have different origins. La/Ce and As/P/V ratios in gasparite-(La) may be used as an indicator of formation conditions.
