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Allabogdanite, (Fe,Ni) (sub 2) P, a new mineral from the Onello Meteorite; the occurrence and crystal structure

Sergey N. Britvin, Nikolay S. Rudashevsky, Sergey V. Krivovichev, Peter C. Burns and Yury S. Polekhovsky
Allabogdanite, (Fe,Ni) (sub 2) P, a new mineral from the Onello Meteorite; the occurrence and crystal structure
American Mineralogist (September 2002) 87 (8-9): 1245-1249

Abstract

Allabogdanite, (Fe,Ni) (sub 2) P, is a new mineral from the Onello iron meteorite (Ni-rich ataxite). It occurs as thin lamellar crystals disseminated in plessite. Associated minerals are nickelphosphide, schreibersite, awaruite, and graphite. Crystals of the mineral, up to 0.4X0.1X0.01 mm, are flattened on (001) with dominant {001} faces, and other faces that are probably {110} and {100}. Mirror twinning resembling that of gypsum is common, with possible twin composition plane {110}. Crystals are light straw-yellow with bright metallic luster. Polished (001) sections look silvery-white against an epoxy background. In reflected light in air, the mineral has a creamy color, with distinct anisotropy from light to dark creamy tint. No bireflectance was observed. R (sub 1) /R (sub 2) (lambda , nm) in air: 48.4/37.2(440), 46.7/36.8(460), 47.0/37.6(480), 47.5/38.1(500), 47.6/38.8(520), 48.2/39.2(540), 49.0/39.9(560), 49.6/40.7(580), 50.1/41.6(600), 50.5/41.9(620), 51.9/43.0(640), 52.3/44.3(660), 53.3/45.0(680), 54.4/46.2(700). No cleavage or parting was observed. Moh's hardness is 5-6; the mineral is very brittle, and its calculated density 7.10 g/cm (super 3) . Its chemical composition (determined by microprobe methods, average of nine analyses) is: Fe 57.7, Ni 20.7, Co 1.4, P 20.4, Total 100.2 wt%, corresponding to (Fe (sub 1.51) Ni (sub 0.50) Co (sub 0.03) ) (sub 2.04) P (sub 0.96) (three atoms per formula unit). Crystal structure: R1 = 0.040 for 138 unique observed (F (sub 0) > or =4 (sub F) ) reflections. Orthorhombic, Pnma, unit-cell parameters refined from powder data: a = 5.748(2), b = 3.548(1), c = 6.661(2) Aa, V = 135.8(1), Aa (super 3) , Z = 4; unit-cell parameters refined from single-crystal data: a = 5.792(7), b = 3.564(4), c = 6.691 (8) Aa, and V = 138.1(3) Aa (super 3) . Strongest reflections in the X-ray powder diffraction pattern are [d in Aa, (1) (hkl)]: 2.238 (100)(112), 2.120(80)(211), 2.073(70)(103), 1.884(50)(013), 1.843(40)(301), 1.788(40)(113), 1.774(40)(020). The mineral is named for Alla Bogdanova, Geological Institute, Kola Science Centre of Russian Academy of Sciences.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 87
Serial Issue: 8-9
Title: Allabogdanite, (Fe,Ni) (sub 2) P, a new mineral from the Onello Meteorite; the occurrence and crystal structure
Affiliation: Saint Petersburg State University, Department of Mineral Deposits, Saint Petersburg, Russian Federation
Pages: 1245-1249
Published: 200209
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 25
Accession Number: 2002-067183
Categories: General mineralogyPetrology of meteorites and tektites
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
N55°30'00" - N61°30'00", E116°30'00" - E137°00'00"
N43°25'00" - N54°30'00", E141°45'00" - E157°00'00"
Secondary Affiliation: Mekhanobar-Analyt Join-Stock Company, RUS, Russian FederationUniversity of Notre Dame, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200221
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