Über strukturelle Beziehungen zwischen Phosphaten (Triphylin) und Silikaten (Olivin) und über die chemische Zusammensetzung von Ardennit

Goßner, B.; Strunz, H.

doi:10.1524/zkri.1932.83.1.415

Cited by 8 publications

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“…Actually, if we consider the elements which enter the T sites, it appears that the total, and particularly the sum of As+V, is in defect in the analyses of As-rich samples, and in large excess in the V-rich samples, thus confirming the suspect of a significant underestimation of arsenic, and overestimation of vanadium, in all earlier analyses. A couple of new analyses on the same Belgian ardennite were published in the following years by Prandtl (1905) and Gossner & Strunz (1932): they showed a maximum vanadium content much lower with respect to the early analyses and on this basis, especially considering the fact that the analysis of Prandtl (1905) corresponded to a very As-rich term, Gossner & Strunz (1932) In the meantime a second occurrence of ardennite had been discovered near Ceres, Piedmont (Italy), that showed an extremely low vanadium content (Zambonini, 1922).…”

Section: Historical Backgroundmentioning

confidence: 99%

History of ardennite and the new mineral ardennite-(V)

Barresi¹,

Orlandi²,

Pasero³

2007

ejm

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Ardennite-(V), ideally Mn 4 [Al 4 (AlMg)][Si 5 V]O 22 (OH) 6 , is the analogue of ardennite, ideally Mn 4 [Al 4 (AlMg)][Si 5 As]O 22 (OH) 6 , with V dominant at the T4 site. The history of the discovery of ardennite is outlined, with special accent on its chemical composition; revision of the old literature evidenced that even if vanadium-containing specimens were considered since the first description, the analytical data contained in the first papers are very questionable, and ardennite has been so far considered an arsenate-silicate. A new occurrence of ardennite-(V) is described from Sparone, Locana Valley (TO), Piedmont, Italy. Here ardennite-(V) occurs within a piemontite-bearing micaschist. Crystals are elongated along [010] and very thin (up to 1 mm in length and a few microns in diameter), are yellow with a white streak, transparent with a vitreous lustre, and brittle. No cleavage or parting were observed. The calculated density is 3.55 g/cm 3. Optically, ardennite-(V) is biaxial, with α > 1.765(5), β < 1.775(5), and γ = 1.775(5), and is weakly pleochroic, with X, Y = pale yellow; Z = yellowish. Electron microprobe analyses (P 2 O 5 0.38 wt.%, As 2 O 5 0.37, V 2 O 5 4.60, SiO 2 31.21, TiO 2 0.21, Al 2 O 3 22.60, Fe 2 O 3 1.64, Cr 2 O 3 0.34, MgO 4.44, MnO tot 23.28, CaO 4.24, Na 2 O 0.02, F 0.17, H 2 O calc 5.70), gave the following empirical formula: [Mn 2+ 3.221 Ca 0.774 Na 0.006 ] =4.001 [Al 4.456 Mg 1.127 Fe 3+ 0.210 Mn 3+ 0.137 Cr 0.046 Ti 0.027 ] =6.003 [Si 5.000 ] [V 0.518 Si 0.315 Al 0.080 P 0.055 As 0.033 ] =1.001 O 21.433 (OH) 6.475 F 0.092. The five strongest peaks in the X-ray powder diffraction pattern [d(Å)(I)(hkl)] are: 2.948(90)(115), 2.609(100)(310/116), 2.033(55)(225), 1.585(75)(425), 1.477(45)(2.2.10). Ardennite-(V) is orthorhombic, space group Pnmm, with a 8.760(3), b 5.838(2), c 18.56(2) Å. Both the new mineral and its name were approved by the IMA CNMNC. Chemical analyses which point to the occurrence of ardennite-(V) were recorded also at Varenche mine, S. Barthelemy, Aosta Valley, Italy, but the crystal showed a marked zoning.

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Section: Historical Backgroundmentioning

confidence: 99%

History of ardennite and the new mineral ardennite-(V)

Barresi¹,

Orlandi²,

Pasero³

2007

ejm

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“…Ferrisicklerite, like all the minerals of the triphylite group, is isotypic with olivine (Gossner & Strunz, 1932).…”

Section: Introductionmentioning

confidence: 99%

The crystal structure of ferrisicklerite, Li<1(Fe3+,Mn2+)PO4

Albertia¹

1976

Acta Crystallogr Sect B

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Ferrisicklerite is a phosphate of the triphylite group isotypic with olivine. The sample in this study has the composition Lil 2+ 2+ 3+ .61Na0.07Mg0.15Ca0.07Fe0.03Mnl.asFe2.45[(PO4)3.76(O4H4)0.25], space group Pmnb with a= 5.918, b= 10-037, c=4.799 A. The refinement of the structure indicates a partial occupancy of the octahedral site M(1) by Li and Na, a complete occupancy of the octahedral site M(2) by the remaining cations with isomorphous substitution between Mn 2+ and Fe 3+ in this site and the partial substitution of the group PO4 by the group (OH)4. The distortion of the coordination polyhedra can be explained in terms of the strong imbalance of the bond strengths to the anions.

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Gittertypen, Strukturen und Dimensionen von Kristallen

Ernst¹,

Hertel²

2013

Landolt-Börnstein

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Über strukturelle Beziehungen zwischen Phosphaten (Triphylin) und Silikaten (Olivin) und über die chemische Zusammensetzung von Ardennit

Cited by 8 publications

References 0 publications

History of ardennite and the new mineral ardennite-(V)

History of ardennite and the new mineral ardennite-(V)

The crystal structure of ferrisicklerite, Li<1(Fe3+,Mn2+)PO4

Gittertypen, Strukturen und Dimensionen von Kristallen

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