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New Mineral Names^*

Glenn Poirier¹, Kim Tait², T. Scott Ercit¹, Ralph Rowe¹ and Paula C . Piilonen^1,

¹ Mineral Sciences Division, Canadian Museum of Nature, P.O. Box 3443, Station D, Ottawa, Ontario K1P 6P4, Canada
² Department of Natural History, Royal Ontario Museum, 100 Queen’s Park, Toronto, Ontario M5S 2C6, Canada

Correspondence: E-mail: ppiilonen@mus-nature.ca

The first 20% of the full text of this article appears below.

ARDENNITE-(V)^*

A.A. Barresi, P. Orlandi, P. Pasero, M. Pasero (2007) History of ardennite and the new mineral ardennite-(V). Eur. J. Mineral., 19, 581–587.

Ardennite-(V) is from an outcrop in the locality of Sparone, Locana Valley (TO), Piedmont, Italy found in a specimen of piemontite-bearing mica schist. Ardennite-(V) occurs only in one thin quartzitic layer in the studied specimens and are associated with quartz, piemontite, and hematite; muscovite is abundant in the specimen, but not in direct contact with ardennite-(V). Other layers are very rich in piemontite or, alternatively, in golden-yellow muscovite and hematite, without any ardennite-(V). It occurs as acicular crystals, typically very thin, tabular and elongated along [010], which can reach 1 mm in length and a few microns in diameter.

Ardennite-(V) is orthorhombic, space group Pnmm, with a = 8.760(3), b = 5.838(2), c = 18.56(2) Å. 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).

Optically, ardennite-(V) is biaxial, with > 1.765(5), β < 1.775(5), and = 1.775(5). Dispersion was not observed. Optical orientation: Z = b. Pleochroism is very weak, with X, Y = pale yellow; Z = yellowish. Crystals of ardennite-(V) are yellow, transparent with a white streak, and brittle. The luster is vitreous; fluorescence was not observed. The hardness has been estimated as 6–7 (Mohs). No cleavage or parting was observed. Density was not measured due to the very small dimensions of crystals but the calculated value is 3.55 g/cm³.

Electron microprobe analyses (P₂O₅ 0.38 wt%, As₂O₅ 0.37, V₂O₅ 4.60, SiO₂ 31.21, TiO₂ 0.21, Al₂O₃ 22.60, Fe₂O₃ 1.64, Cr₂O₃ 0.34, MgO 4.44, MnO_tot 23.28, CaO 4.24, Na₂O 0.02, F 0.17, H₂O_calc 5.70), gave the following empirical formula: . . . [Full Text of this Article]