Structure of Ca-rich agardite, (Ca0.40Y0.31Fe0.09Ce0.06La0.04Nd0.01)Cu6.19[(AsO4)2.42(HAsO4)0.49](OH)6.38.3H2O

Aruga, Atsushi; Nakai, Ikuo

doi:10.1107/s0108270185003158

Cited by 20 publications

(31 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The structure was refi ned with fi xed isotropic thermal parameters for all atoms (U iso = 0.01), and full occupancy was assumed for all atomic sites. Despite the poor data available, we can consider that the refi ned structure-model is isotypic with the one of Ca-rich agardite, reported by Aruga & Nakai (1985). However, the structures can only be compared on a topological level; the poor quality of the underlying data does not allow a discussion of bond lengths and angles.…”

Section: X-ray Single-crystal and Powder-diffraction Datamentioning

confidence: 99%

“…The results lead to the ideal simplifi ed formula CaCu 6 [(PO 4 ) 2 (PO 3 OH)(OH) 6 ]• 3 H 2 O. In view of the existence of only one X site (e.g., one As in the X site described by Aruga & Nakai 1985) and the disordered character of the substitution of OH -for O 2-at the O(3) site in the crystal structure of calciopetersite-type minerals, it seems better to assign a general formula CaCu 6 [PO 3 (O 2/3 (OH) 1/3 )] 3 (OH) 6 • 3 H 2 O to calciopetersite.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…On the other hand, Ca in goudeyite is considered to occupy the Cu site (Wise 1978). Aruga & Nakai (1985) described the crystal structure of Ca-rich agardite-(Y) (44 mol.% of Ca at the M site) and assumed that substitution of a trivalent cation (Bi 3+ or REE 3+ ) at the M site by divalent Ca 2+ cation is charge-balanced by a concomitant substitution of OH -for O 2-at the O(3) site in the crystal structure (attributed to a HAsO 4 or AsO 3 OH group). Zálesíite, CaCu 6 [(AsO 4 )(AsO 3 OH)(OH) 6 ]•3H 2 O, was described by Sejkora et al (1999) as the fi rst Ca-dominant member of the mixite group; however, the phase corresponding to zálesíite was described as agardite-(Ca) from Monte Cervandone (Italy), Vosges (France) and Black Forest (Germany) (Albertini 1994, Kolitsch 1997a, Walenta 1992.…”

Section: Sommairementioning

confidence: 99%

“…The X-ray-diffraction data (734 refl ections) were found to be of very poor quality, with a mean I/ I = 2.82. For the structure refi nement, the space group was set to P6 3 /m in accordance with mixite and agardite-(Y) (Mereiter & Preisinger 1986, Aruga & Nakai 1985. The structure was refi ned with fi xed isotropic thermal parameters for all atoms (U iso = 0.01), and full occupancy was assumed for all atomic sites.…”

Section: X-ray Single-crystal and Powder-diffraction Datamentioning

confidence: 99%

“…Positions and intensities of refl ections were calculated using the Pearson VII profi le-shape function with the ZDS program package (Ondruš 1995). The measured pattern was indexed by analogy of isotypic hexagonal (P6 3 /m) Ca-rich agardite (Aruga & Nakai 1985), mixite (Mereiter & Preisinger 1986) and zále-síite (Sejkora et al 1999). The unit-cell parameters of calciopetersite [a 13.284(4) Å, c 5.902(4) Å, V 902.0(6) Å 3 , Z = 2] were calculated by the least-squares refi nement program of Burnham (1962).…”

Section: X-ray Single-crystal and Powder-diffraction Datamentioning

confidence: 99%

See 4 more Smart Citations

Calciopetersite From Domasov Nad Bystrici, Northern Moravia, Czech Republic, a New Mineral Species of the Mixite Group

Sejkora¹,

Novotný²,

Novák³

et al. 2005

The Canadian Mineralogist

View full text Add to dashboard Cite

Calciopetersite, ideally CaCu 6 [(PO 4 ) 2 (PO 3 OH)(OH) 6 ]•3H 2 O, occurs in cavities in quartz veins at an abandoned quarry near Domašov nad Bystřicí, 20 km northeast of Olomouc, northern Moravia, Czech Republic. It forms translucent to transparent minute acicular crystals, up to 0.4 mm in length and 5-20 m in width, with a hexagonal outline, clustered in fi ne radiating sprays (up to 0.1 ϫ 0.5 mm). It is soft and brittle with an uneven fracture, but the hardness and density could not measured; no cleavage was observed. It has an olive green color, light olive green streak and vitreous luster. No fl uorescence was observed in ultraviolet light. It originated by weathering of chalcopyrite and other copper sulfi des and is associated with chrysocolla, the Ce-dominant analogue of petersite-(Y), malachite, allophane, goethite, lepidocrocite, chalcopyrite, pyrite, covellite, chalcocite and quartz. The name calciopetersite denotes that it is the Ca-dominant analogue of petersite-(Y). Calciopetersite is hexagonal, space group P6 3 /m inferred from the isotypic agardite-(Y) and mixite, a 13.284 (4) Elle se présente en infi mes cristaux aciculaires translucides à transparents atteignant une longueur de 0.4 mm et entre 5 et 20 m de diamètre, avec une section hexagonale, regroupés en amas radiaires atteignant 0.1 ϫ 0.5 mm. Cʼest un minéral mou et cassant, avec une fracture inégale, mais nous nʼavons pas pu en établir la dureté ou la densité. Aucun clivage nʼest évident. Sa couleur est vert olive, et sa rayure, vert olive pâle; lʼéclat est vitreux. Aucune fl uorescence nʼa été observée en lumière ultraviolette. On attribue la calciopetersite à la météorisation de la chalcopyrite et autres sulfures de cuivre; elle est associée au chrysocolle, lʼanalogue à dominance de Ce de la petersite-(Y), et à malachite, allophane, goethite, lépidocrocite, chalcopyrite, pyrite, covellite, chalcocite et quartz. Le nom calciopetersite rappelle la dominance de Ca dans un analogue de la petersite-(Y). La calciopetersite est hexagonale, groupe spatial P6 3 /m, déduit à partir de lʼagardite-(Y) et la mixite, phases isotypiques, a 13.284(4), c 5.902(4) Å, V 902.0(6) Å 3 , Z = 2, et D calc 3.332 g/cm 3 . Les huit raies les plus intenses du spectre de diffraction X, méthode des poudres [d en Å(I)(hkl)] sont: 11.51(100)(100), 4.346 (88)(210)

show abstract

Section: X-ray Single-crystal and Powder-diffraction Datamentioning

confidence: 99%

Section: Chemical Compositionmentioning

confidence: 99%

Section: Sommairementioning

confidence: 99%

Section: X-ray Single-crystal and Powder-diffraction Datamentioning

confidence: 99%

Section: X-ray Single-crystal and Powder-diffraction Datamentioning

confidence: 99%

See 3 more Smart Citations

Calciopetersite From Domasov Nad Bystrici, Northern Moravia, Czech Republic, a New Mineral Species of the Mixite Group

Sejkora¹,

Novotný²,

Novák³

et al. 2005

The Canadian Mineralogist

View full text Add to dashboard Cite

show abstract

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

Frost¹,

Erickson²,

Weier³

et al. 2004

J Raman Spectroscopy

View full text Add to dashboard Cite

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.

show abstract

Raman microscopy of the mixite mineral BiCu₆(AsO₄)₃(OH)₆·3H₂O from the Czech Republic

Frost

Čejka

Sejkora

et al. 2009

J Raman Spectroscopy

View full text Add to dashboard Cite

Raman microscopy of the mixite mineral BiCu 6 (AsO 4 ) 3 (OH) 6 ·3H 2 O from Jáchymov and from Smrkovec (both Czech Republic) has been used to study their molecular structure. The presence of (AsO 4 ) 3− , (AsO 3 OH) 2− , (PO 4 ) 3− and (PO 3 OH) 2− units, as well as molecular water and hydroxyl ions, was inferred. O-H· · ·O hydrogen bond lengths were calculated from the Raman and infrared spectra using Libowitzky's empirical relation. Small differences in the Raman spectra between both samples were observed and attributed to compositional and hydrogen-bonding network differences.

show abstract

Structure of Ca-rich agardite, (Ca0.40Y0.31Fe0.09Ce0.06La0.04Nd0.01)Cu6.19[(AsO4)2.42(HAsO4)0.49](OH)6.38.3H2O

Cited by 20 publications

References 1 publication

Calciopetersite From Domasov Nad Bystrici, Northern Moravia, Czech Republic, a New Mineral Species of the Mixite Group

Calciopetersite From Domasov Nad Bystrici, Northern Moravia, Czech Republic, a New Mineral Species of the Mixite Group

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

Raman microscopy of the mixite mineral BiCu₆(AsO₄)₃(OH)₆·3H₂O from the Czech Republic

Contact Info

Product

Resources

About

Structure of Ca-rich agardite, (Ca0.40Y0.31Fe0.09Ce0.06La0.04Nd0.01)Cu6.19[(AsO4)2.42(HAsO4)0.49](OH)6.38.3H2O

Cited by 20 publications

References 1 publication

Calciopetersite From Domasov Nad Bystrici, Northern Moravia, Czech Republic, a New Mineral Species of the Mixite Group

Calciopetersite From Domasov Nad Bystrici, Northern Moravia, Czech Republic, a New Mineral Species of the Mixite Group

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

Raman microscopy of the mixite mineral BiCu6(AsO4)3(OH)6·3H2O from the Czech Republic

Contact Info

Product

Resources

About

Raman microscopy of the mixite mineral BiCu₆(AsO₄)₃(OH)₆·3H₂O from the Czech Republic