L'agardite, une nouvelle espèce minérale et le problème du chlorotile

Dietrich, Jacques E.; Orliac, Marcel; Permingeat, François

doi:10.3406/bulmi.1969.6392

Cited by 10 publications

(10 citation statements)

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“…vite (Ca 3 REEAl 2 SO 4 F 13 •10H 2 O). Those minerals commonly occur as alteration products in crystalline rocks (Berger et al 2008, Krenn & Finger 2007, Nagy et al 2002, Nagy & Draganits 1999, Lottermoser 1990 or in the oxidation zone of ore deposits (Dietrich et al 1969, Walenta 1979, 1982.…”

Section: (Traduit Par La Rédaction)mentioning

confidence: 99%

“…The REE-bearing phosphate analogue is petersite. Several previous studies on mixite-group minerals exist: Dietrich et al (1969) qualitatively analyzed thirty-one mixite-group minerals from different localities worldwide and found samples containing either Bi or REE. Walenta (1960 In the Schwarzwald ore district, southwestern Germany, minerals of the rare-earth elements (REE) are commonly developed as secondary supergene phases in hydrothermal veins (e.g., Walenta 1992).…”

Section: (Traduit Par La Rédaction)mentioning

confidence: 99%

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The Redistribution of Rare-Earth Elements in Secondary Minerals of Hydrothermal Veins, Schwarzwald, Southwestern Germany

Göb¹,

Wenzel²,

Bau³

et al. 2011

The Canadian Mineralogist

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Minerals of the rare-earth elements (REE) occur as supergene phases in the Schwarzwald ore district, southwestern Germany. They form by alteration of hydrothermal fluorite-barite-quartz-carbonate veins with various associations, including Cu-Pb, Pb-Zn and Co-Bi-Ag-U assemblages in sandstones, gneisses and granites. The REE minerals, including mixite-group minerals ([REE,Bi,Ca,Pb]Cu 6 (AsO 4 ,AsO 3 OH) 3 OH 6 •3H 2 O), rhabdophane and churchite (REEPO 4 •H 2 O and REEPO 4 •2H 2 O), chukhrovite (Ca 3 REEAl 2 SO 4 F 13 •10H 2 O) and bastnäsite (REECO 3 F), were analyzed by electron microprobe and LA-ICP-MS. In addition, REE concentrations in secondary fluorite, calcite and Mn oxides cogenetic with the REE minerals were determined by LA-ICP-MS. Results of analyses of 74 mixite-group samples from 20 localities in the Schwarzwald ore district show that continuous miscibility is possible between REE and Ca and between Bi and Ca end-members. In contrast, no miscibility seems to exist between the Bi and REE end-members, and only Ca-rich members can accommodate small amounts of both Bi and REE. The REE phosphates churchite and rhabdophane do not occur at the same locality in the Schwarzwald, which is probably dependent on which REE (light or heavy) predominate at a certain locality. Whereas churchite incorporates heavy REE (HREE), rhabdophane prefers light REE (LREE). Dependent on the source of the REE, either HREE or LREE dominate in an alteration fluid and, consequently, only one type of REE phosphate forms. The HREE dominate in such a fluid if REE originate from dissolved "pitchblende", whereas the LREE dominate if the altered host-rock or dissolved fluorite are the source of the REE. The REE contents of Mn oxides and calcite cogenetic with REE-bearing mixite-group minerals show that the REE distribution of secondary minerals can be influenced by each other. Whereas the Mn oxides incorporate Ce 4+ resulting in a positive Ce anomaly, a cogenetic mixite-group mineral develops a negative anomaly, which shows that Ce anomalies are coupled. Calcite intergrown with a mixite-group mineral can only incorporate those REE that are not consumed by the latter. These processes involve the distribution of REE between minerals on the micrometer scale and do not take place until minerals precipitate. However, sorption and complexation processes also take place during transport on a larger scale and produce decoupled Ce anomalies. This interplay between large-and small-scale processes results in a complex redistribution of REE during remobilization.

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Section: (Traduit Par La Rédaction)mentioning

confidence: 99%

Section: (Traduit Par La Rédaction)mentioning

confidence: 99%

The Redistribution of Rare-Earth Elements in Secondary Minerals of Hydrothermal Veins, Schwarzwald, Southwestern Germany

Göb¹,

Wenzel²,

Bau³

et al. 2011

The Canadian Mineralogist

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“…For background to the mixite mineral group, see: Dietrich et al (1969); Hess (1983); Aruga & Nakai (1985); Mereiter & Preisinger (1986); Olmi et al (1988); Miletich et al (1997); Kunov et al (2002); Frost et al (2005); Sejkora et al (2005); Plá šil et al (2009). For research on the sorption of toxic chemicals by minerals, see: Leone et al (2013).…”

Section: Related Literaturementioning

confidence: 99%

“…Agardite-(Y) was first described from the oxidation zone of the Bou-Skour copper deposit in Jebel Sahro, Morocco (Dietrich et al, 1969). It has since been found in many other localities, including Germany, England, Spain, France, U.S. (Dietrich et al, 1969), Italy (Olmi et al, 1988), Czech Republic (Plášil et al, 2009 and Bulgaria (Kunov et al, 2002). In these studies, unit-cell parameters were presented, but no details of the crystal structure.…”

Section: S1 Commentmentioning

confidence: 99%

Agardite-(Y), Cu²⁺₆Y(AsO₄)₃(OH)₆·3H₂O

et al. 2013

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Key indicators: single-crystal X-ray study; T = 293 K; mean () = 0.000 Å; H-atom completeness 0%; disorder in main residue; R factor = 0.032; wR factor = 0.086; data-to-parameter ratio = 13.1.Agardite-(Y), with a refined formula of Cu 6 A(TO 4 ) 3 (OH) 6 Á-3H 2 O, where nine-coordinated cations in the A-site include rare earth elements along with Al, Ca, Pb, or Bi, and the T-site contains P or As. This study presents the first structure determination of agardite-(Y). It is based on the single-crystal X-ray diffraction of a natural sample from Jote West mine, Pampa Larga Mining District, Copiapo, Chile. The general structural feature of agardite-(Y) is characterized by infinite chains of edge-sharing CuO 5 square pyramids (site symmetry 1) extending down the c axis, connected in the ab plane by edge-sharing YO 9 polyhedra (site symmetry 6..) and cornersharing AsO 4 tetrahedra (site symmetry m..). Hydroxyl groups occupy each corner of the CuO 5 -square pyramids not shared by a neighboring As or Y atom. Each YO 9 polyhedron is surrounded by three tubular channels. The walls of the channels, parallel to the c axis, are six-membered hexagonal rings comprised of CuO 5 and AsO 4 polyhedra in a 2:1 ratio, and contain free molecules of lattice water. Related literature ExperimentalCrystal data

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“…8 -10 The crystal structures of natural mixite and agardite compounds reveal a microporous framework structure 4,8 with a framework similar to that of zeolites. 10 Dietrich et al 11 originally proposed that the water in agardite was zeolitic. As such these minerals may have potential for catalytic applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of the lanthanide ionic radius on the Raman spectroscopy of lanthanide agardite minerals

Frost¹,

Erickson²,

Weier³

et al. 2004

J Raman Spectroscopy

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Raman microscopy was used to study the Raman spectra of a series of rare earth element agardites ACu 6 (AsO 4 ) 3 (OH) 6 ·3H 2 O, where A = lanthanide 3+ . These minerals have a porous framework similar to that of zeolites with a structure based on (A 3+ ) 1−x (A 2+ ) x Cu 6 (OH) 6 (AsO 4 ) 3−x (AsO 3 OH) x . Two sets of AsO stretching vibrations were found and assigned to the vibrational modes of AsO 4 and HAsO 4 units. The position of selected bands was found to be sensitive to the lanthanide ionic radius. Raman spectra of the low-wavenumber region are complex. Bending modes of the AsO 4 and HAsO 4 units were found to be sensitive to the ionic radius of the lanthanide ion. Linear relationships between positions of the Raman bands were derived, with correlation coefficients >0.90.

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L'agardite, une nouvelle espèce minérale et le problème du chlorotile

Cited by 10 publications

References 0 publications

The Redistribution of Rare-Earth Elements in Secondary Minerals of Hydrothermal Veins, Schwarzwald, Southwestern Germany

The Redistribution of Rare-Earth Elements in Secondary Minerals of Hydrothermal Veins, Schwarzwald, Southwestern Germany

Agardite-(Y), Cu²⁺₆Y(AsO₄)₃(OH)₆·3H₂O

Effect of the lanthanide ionic radius on the Raman spectroscopy of lanthanide agardite minerals

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L'agardite, une nouvelle espèce minérale et le problème du chlorotile

Cited by 10 publications

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The Redistribution of Rare-Earth Elements in Secondary Minerals of Hydrothermal Veins, Schwarzwald, Southwestern Germany

The Redistribution of Rare-Earth Elements in Secondary Minerals of Hydrothermal Veins, Schwarzwald, Southwestern Germany

Agardite-(Y), Cu2+6Y(AsO4)3(OH)6·3H2O

Effect of the lanthanide ionic radius on the Raman spectroscopy of lanthanide agardite minerals

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Agardite-(Y), Cu²⁺₆Y(AsO₄)₃(OH)₆·3H₂O