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Brownleeite

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Formula:
MnSi
Crystal System:
Isometric
Name:
Named for University of Washington astronomer Donald Brownlee, who founded the field of IDP research.
The mineral was discovered within an interplanetary dust particle (or IDP) that is believed to have originated from comet 26P/Grigg-Skjellerup. Type material is in particles less than 1/10,000 of an inch across (or < 0.0025mm).


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Classification of BrownleeiteHide

Approved
Approval Year:
2008
1.BB.

1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
B : Metallic Carbides, Silicides, Nitrides and Phosphides
B : Silicides

Pronounciation of BrownleeiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Chemical Properties of BrownleeiteHide

Formula:
MnSi

Crystallography of BrownleeiteHide

Crystal System:
Isometric
Class (H-M):
2 3 - Tetartoidal
Space Group:
P21 3
Cell Parameters:
a = 4.557 Å
Unit Cell V:
94.63 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.223 (18)
2.632 (16)
2.038 (100)
1.861 (50)
1.374 (10)
1.218 (24)
0.9946 (12)
0.8464 (15)

Type Occurrence of BrownleeiteHide

Geological Setting of Type Material:
A particle of cosmic dust collected by a high-altitude research aircraft.

Synonyms of BrownleeiteHide

Related Minerals - Nickel-Strunz GroupingHide

1.BB.ZangboiteTiFeSi2Orth. mmm (2/m 2/m 2/m) : Pbam
1.BB.05Suessite(Fe,Ni)3Si
1.BB.05MavlyanoviteMn5Si3Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm
1.BB.10UM2001-18-Si:CuPtSn(Cu,Pt)4Si
1.BB.10Perryite(Ni,Fe)5(Si,P)2Trig.
1.BB.15NaquiteFeSiIso. 2 3 : P21 3
1.BB.20LinzhiiteFeSi2Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm
1.BB.25LuobusaiteFe0.84Si2Orth. mmm (2/m 2/m 2/m) : Cmca
1.BB.30GupeiiteFe3SiIso.
1.BB.35HapkeiteFe2SiIso. m3m (4/m 3 2/m) : Pm3m
1.BB.40XifengiteFe5Si3Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for BrownleeiteHide

Reference List:
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Internet Links for BrownleeiteHide

Localities for BrownleeiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Outer Space (TL)
 
http://www.nasa.gov/home/hqnews/2008/jun/HQ_08143_comet_dust.html
Mineral and/or Locality  
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