Papers by Tatiana Grokhovskaya
The Canadian Mineralogist, 2021
Palladothallite, Pd3Tl, is a new mineral discovered in the Monchetundra layered intrusion, Kola P... more Palladothallite, Pd3Tl, is a new mineral discovered in the Monchetundra layered intrusion, Kola Peninsula, Russia. Palladothallite occurs in orthopyroxenite with disseminated Ni-Cu-Fe sulfides and in near-surface oxidized ore of an orthopyroxenite unit. In the holotype specimen, the new mineral forms anhedral grains about 1 to 20 μm in size intergrown with bortnikovite (Pt4Cu3Zn). Palladothallite and bortnikovite form a rim around tulameenite (Pt2FeCu), Pt-Pd-Fe-Cu alloys, and Pt-Pd-Fe-Cu “oxides” in a goethite matrix. In plane-polarized light, palladothallite is white, anisotropy was not observed; it exhibits no internal reflections. Reflectance values of palladothallite in air (R' in %) are: 53.9 at 470 nm, 57.1 at 546 nm, 59.4 at 589 nm and 61.7 at 650 nm. Twelve electron probe microanalyses of palladothallite gave an average composition (in wt.%): Pd 59.99, Cu 1.19, Fe 0.35, Ag 1.1, Tl 35.64, Se 0.34, and S 0.09, total 99.67, corresponding to the empirical formula (Pd2.894Cu...
Mineralogy and Petrology, 2020
Monchetundraite, Pd 2 NiTe 2 is a new mineral discovered in the the Monchetundra layered intrusio... more Monchetundraite, Pd 2 NiTe 2 is a new mineral discovered in the the Monchetundra layered intrusion, Kola Peninsula, Russia. It forms euhedral grains (up to about 20 μm) intergrown with kotulskite and pentlandite. Monchetundraite is brittle and has a metallic lustre. In plane-polarized light, monchetundraite is white to creamy pinkish white, strongly pleochroic and strongly anisotropic on prismatic sections with rotations tints of pale blue, orange and olive green; it exhibits no internal reflections.
European Journal of Mineralogy, 2017
This contribution relates to the experiences of applied research for the construction of three-di... more This contribution relates to the experiences of applied research for the construction of three-dimensional models relative to landscape complexes through the use of so-called three-dimensional photogrammetry. Survey expeditions for studying historical architecture are increasingly in demand today and methods for producing metric data able to meet the descriptive requirements of drawings of buildings are constantly evolving. Many programmes have come and gone in recent years in an attempt to generate automatic 3D models to manage the complexity of real space; when the object of the survey is a multi-composition system covering different levels of investigation and scales of representation, the landscape needs to be broken down and recomposed using techniques for the discretization of architectural forms and images.
The Canadian Mineralogist, 2016
The crystal structures of isomertieite, Pd 11 Sb 2 As 2 , (I) from the Monche-Tundra intrusion, M... more The crystal structures of isomertieite, Pd 11 Sb 2 As 2 , (I) from the Monche-Tundra intrusion, Monchegorsk Igneous Complex (MIC), Kola Peninsula, Russia, and törnroosite, Pd 11 As 2 (Te 1.7 Bi 0.3) R2 (IIa) and Pd 11 As 2 (Te 1.3 Bi 0.7) R2 (IIb) from the South Sopcha intrusion, MIC, Kola Peninsula, Russia, were refined on the basis of X-ray diffraction data collected from single crystals. The two minerals were found to exhibit the same structure, cubic, space group Fd 3m, Z ¼ 8, with unit-cell parameters for (I): a 12.297(5)Å, V 1859.3(2)Å 3 ; for (IIa): a 12.350(2)Å, V 1883.6(4)Å 3 ; and for (IIb): a 12.370(1)Å, V 1892.9(3)Å 3. The structures were refined to R 1 ¼ 0.056 (I), 0.014 (IIa), 0.018 (IIb). The isomertieite crystal-chemical formula was confirmed. The Bi-forTe substitution in törnroosite was found to not affect the main structural topology. In the structure of the two minerals there are three symmetrically independent Pd positions: M1, M2, and M3. M1 forms M1As 4 tetrahedra, M2 forms M2As 2 Sb 2 (I) or M2As 2 Te 2 (II) tetrahedra, and M3 forms M3Sb 3 (I) or M3Te 3 (II) triangles connected together via common edges and forming a framework in the structure.
Mineralogical Magazine, 2019
Nipalarsite, Ni8Pd3As4, is a new platinum-group mineral discovered in the sulfide-bearing orthopy... more Nipalarsite, Ni8Pd3As4, is a new platinum-group mineral discovered in the sulfide-bearing orthopyroxenite of the Monchetundra layered intrusion, Kola Peninsula, Russia (67°52′22″N, 32°47′60″E). Nipalarsite forms anhedral grains (5–80 µm in size) in intergrowths with sperrylite, kotulskite, hollingworthite, isomertieite, menshikovite, palarstanide, nielsenite and monchetundtraite enclosed in pentlandite, anthophyllite, actinolite and chlorite. Nipalarsite is brittle, has a metallic lustre and a grey streak. In plane-polarised light, nipalarsite is light grey with a blue tinge. Reflectance values in air (in %) are: 46.06 at 470 nm, 48.74 at 546 nm, 50.64 at 589 nm and 54.12 at 650 nm. Values of VHN20 fall between 400.5 and 449.2 kg.mm–2, with a mean value of 429.9 kg.mm–2, corresponding to a Mohs hardness of ~4. The average result of 27 electron microprobe wavelength dispersive spectroscopy analyses of nipalarsite is (wt.%): Ni 44.011, Pd 28.74, Fe0.32, Cu 0.85, Pt 0.01, Au 0.05, As 2...
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Papers by Tatiana Grokhovskaya