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Frontier Mountain 90233
Basic information Name: Frontier Mountain 90233
     This is an OFFICIAL meteorite name.
Abbreviation: FRO 90233
Observed fall: No
Year found: 1990 or 1991
Country: Antarctica [Collected jointly by EUROMET and PNRA]
Mass:help 31.9 g
Classification
  history:
NHM Catalogue:  5th Edition  (2000)  Ureilite
Meteoritical Bulletin:  MB 89  (2005)  Ureilite-mmict
MetBase:  v. 7.1  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 499 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Writeuphelp
Writeup from MB 89:

Frontier Mountain 90233

Antarctica

Found 1991 January 10

Achondrite (monomict ureilite)

A 31.89 g stony fragment was found by a PNRA/EUROMET team on the Frontier Mountain blue ice field. Mineralogy and classification (A. M. Fioretti and R. Carampin, Istituto di Geoscienze e Georisorse – CNR, Padova): FRO 90233 is a relatively coarse-grained (grain-size up to 2 mm) monomict ureilite composed of 76% olivine, 16% low-Ca pyroxene and 8% interstitial graphite. Olivine has Fo77 average core composition (range Fo75.4-78.5) and Fo90.5 reduced portions. Pyroxenes typically occur as mosaicized, turbid, twinned crystals with En76 Wo4.7 composition. Graphite forms intergranular flakes up to 1 mm in size. The shock stage is S4. Weathering is minor. Specimens: main mass, 22.6 g, one thin section, MNA-SI; 8.79 g and one thin section, OU.

Data from:
  MB89
  Table 3
  Line 6:
Date:10 Jan 1991
Latitude:72°57'22"S
Longitude:160°26'18"W
Mass (g):31.89
Pieces:1
Class:Ure
Classifier:A. M. Fioretti and R. Carampin, Pad
Main mass:MNA-SI
Comments:mbr; thin section, MNA-SI
Institutions
   and collections
MNA-SI: Museo Nazionale dell'Antartide, Università di Siena, Via Laterina 8, I-53100 Siena, Italy; Website (institutional address; updated 13 Dec 2011)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
CNR: Instituto di Geoscienze e Georisorse, Consiglio Nazionale delle Richerche, Sez. Di Padova, Corso Garibaldi 37, 35100 Padova, Italy (institutional address)
Catalogs:
Search for this meteorite in the Museo Nazionale dell'Antartide database (Siena, Italy):   
References: Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (72° 59' 27"S, 160° 22' 33"E)
     Recommended::   (72° 57' 22"S, 160° 26' 18"E)
Note: the NHM and MetBase coordinates are 4.4 km apart

Statistics:
     This is 1 of 38940 approved meteorites from Antarctica (plus 5051 unapproved names)
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