Brownleeite

Brownleeite
General
Category	Native element class, Fersilicite group
Formula (repeating unit)	MnSi
IMA symbol	Bwn[1]
Strunz classification	1.XX.00
Dana classification	01.01.23.07
Crystal system	Isometric
Crystal class	Tetartoidal (23) H-M symbol: (23)
Space group	P213
Identification
Crystal habit	Cubic grain in microscopic dust particle (< 2.5 μm)
References	[2][3]

Brownleeite is a silicide mineral with chemical formula MnSi. It was discovered by researchers of the Johnson Space Center in Houston while analyzing the Pi Puppid particle shower of the comet 26P/Grigg-Skjellerup. The only other known natural manganese silicide is mavlyanovite, Mn₅Si₃.[4]

Overview

The particles were collected from the stratosphere over south-western US in April 2003 using an ER-2 high-altitude research aircraft of NASA. The team of researchers from US, Germany and Japan was led by NASA scientist Keiko Nakamura-Messenger.[5][6]

To determine the mineral's origin and examine other dust materials, a new transmission electron microscope was installed in 2005 at Johnson Space Center.[7]

The mineral name was approved by the International Mineralogical Association (IMA Number 2008-011).[8] The NASA scientists named the mineral after Donald E. Brownlee, professor of astronomy at the University of Washington, Seattle, because of his pioneering research on interplanetary dust particles.[9]

See also

• Comet dust

References

1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
2. http://webmineral.com/data/Brownleeite.shtml Webmineral data
3. http://www.mindat.org/min-36014.html Mindat.org
4. Mindat, http://www.mindat.org/min-38826.html
5. "University of Washington News of Juni 12, 2008". Archived from the original on 2008-07-08. Retrieved 2008-06-14.
6. Newswise: Like a Rock: New Mineral Named for Astronomer Retrieved on June 15, 2008
7. NASA News Releases June 12, 2008: NASA Finds New Type of Comet Dust Mineral
8. Minerals approved by the IMA-CNMNC in June 2008^[permanent dead link‍]
9. Universe Today June 12, 2008: Alien Mineral From Comet Dust Found in Earth's Atmosphere

External links

• "Brownleeite: The First New Mineral Identified From a Comet". Planetary Science Research Discoveries.