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Brownleeite

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Formula:
MnSi
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).

Classification of Brownleeite

Approved 2008
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First Recorded Occurrence of Brownleeite

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

Crystallography of Brownleeite

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

Chemical Properties of Brownleeite

Formula:
MnSi
Essential elements:
All elements listed in formula:

Other Names for Brownleeite

Name in Other Languages:

Other Information

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 Brownleeite

Internet Links for Brownleeite

Localities for Brownleeite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Outer Space
 
http://www.nasa.gov/home/hqnews/2008/jun/HQ_08143_comet_dust.html
Mineral and/or Locality  
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