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Brownleeite: A new manganese silicide mineral in an interplanetary dust particle
-
Keiko Nakamura-Messenger
,
Lindsay P. Keller
Published/Copyright:
April 2, 2015
Abstract
Brownleeite, ideally stoichiometric MnSi, is a manganese silicide not previously observed in nature that was discovered within an interplanetary dust particle that likely originated from a comet. Three submicrometer brownleeite grains were found, with one of them poikilitically enclosed by Mnbearing forsterite. Owing to the small size of the brownleeite grains, it was not possible to determine conventional macroscopic properties of this mineral; however, the chemical composition and crystal structure were well constrained by extensive quantitative energy dispersive X-ray analysis and electron diffraction using transmission electron microscopy (TEM). The crystal system for brownleeite is cubic (a = 4.557 Å) with space group P213, cell volume = 94.63 Å3, Z = 4, density (calculated) = 2.913 g/cm3, and empirical formula: (Mn0.77Fe0.18Cr0.05)Si. These brownleeite grains likely formed as high-temperature condensates either in the early Solar System or in the outflow of an evolved star or supernova explosion.
Keywords: MnSi; new minerals; electron microscopy; TEM; electron diffraction; lunar and planetary studies; IDPs
Received: 2009-4-1
Accepted: 2009-9-29
Published Online: 2015-4-2
Published in Print: 2010-2-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
MnSi;
new minerals;
electron microscopy;
TEM;
electron diffraction;
lunar and planetary studies;
IDPs
Articles in the same Issue
- Brownleeite: A new manganese silicide mineral in an interplanetary dust particle
- Simulation of thermodynamic mixing properties of actinide-containing zircon solid solutions
- Multilevel modular mesocrystalline organization in red coral
- High-pressure behavior of 2M1 muscovite
- Chopinite-sarcopside solid solution, [(Mg,Fe)3□](PO4)2, in GRA95209, a transitional acapulcoite: Implications for phosphate genesis in meteorites
- Distribution of rare earth elements in lunar zircon
- Methodological re-evaluation of the electrical conductivity of silicate melts
- Site-specific infrared O-H absorption coefficients for water substitution into olivine
- High-pressure phase transition of a natural pigeonite
- Location and quantification of hydroxyl in wadsleyite: New insights
- Optical spectroscopic study of natural Fe-rich Pizzo Forno staurolite at different temperatures and pressures
- Metasideronatrite: Crystal structure and its relation with sideronatrite
- Optical absorption, luminescence, and electron paramagnetic resonance (EPR) spectroscopy of crystalline to metamict zircon: Evidence for formation of uranyl, manganese, and other optically active centers
- Factors responsible for crystal-chemical variations in the solid solutions from illite to aluminoceladonite and from glauconite to celadonite
- REE diffusion in olivine
- Phase transition induced by solid solution: The BCa-BMg substitution in richteritic amphiboles
- Aiolosite, Na2(Na2Bi)(SO4)3Cl, a new sulfate isotypic to apatite from La Fossa Crater, Vulcano, Aeolian Islands, Italy
- Gayite, a new dufrénite-group mineral from the Gigante granitic pegmatite, Córdoba province, Argentina
- Galliskiite, Ca4Al2(PO4)2F8·5H2O, a new mineral from the Gigante granitic pegmatite, Córdoba province, Argentina
- Description and crystal structure of liversidgeite, Zn6(PO4)4·7H2O, a new mineral from Broken Hill, New South Wales, Australia
- Evidence of dmisteinbergite (hexagonal form of CaAl2Si2O8) in pseudotachylyte: A tool to constrain the thermal history of a seismic event
- Partitioning of Eu between augite and a highly spiked martian basalt composition as a function of oxygen fugacity (IW-1 to QFM): Determination of Eu2+/Eu3+ ratios by XANES
- Density functional calculation of the infrared spectrum of surface hydroxyl groups on goethite (α-FeOOH)
- X-ray diffraction and Mössbauer spectroscopy of Fe3+-bearing Mg-silicate post-perovskite at 128–138 GPa
