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Frontier Mountain 90200
Basic information Name: Frontier Mountain 90200
     This is an OFFICIAL meteorite name.
Abbreviation: FRO 90200
Observed fall: No
Year found: 1990 or 1991
Country: Antarctica [Collected jointly by EUROMET and PNRA]
Mass:help 3.19 g
NHM Catalogue:  5th Edition  (2000)  OC
Meteoritical Bulletin:  MB 89  (2005)  Ureilite-pmict
MetBase:  v. 7.1  (2006)  Ureilite-pmict
Recommended:  Ureilite-pmict    [explanation]

This is 1 of 32 approved meteorites classified as Ureilite-pmict.   [show all]
Search for other: Achondrites, Ureilites
Writeup from MB 89:

Frontier Mountain 90200


Found 1991 January 10

Achondrite (polymict ureilite)

A 3.19 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 90200 is a polymict ureilite breccia. Lithic fragments are <2 mm in size and appear oriented. Olivine in ureilite clasts ranges from Fo75 to Fo92 shows highly reduced rims (up to Fo94) and have CaO=0.35 wt.% mean content. Low-Ca pyroxene ranges Wo0.5-14, En54-94. Augite is only found as isolated crystals. Individual plagioclase crystals range from albitic (Ab91.3An0.3 Or8.4) to anortitic (Ab4.5 An95.5) composition. One igneous-textured clast consists of euhedral olivine (Fo85-88, CaO 0.1 wt.%), low-Ca pyroxene (En68-71 Wo13-8) and skeletal Ca-rich pyroxene in a feldspathic Fe-rich glass. Two very fine-grained dark clasts, about 2 mm in size, are similar to matrix of carbonaceous chondrites, containing both Mg-rich and Fe-rich hydrous minerals. Kamacite and troilite are present as minor phases in the breccia. Carbon-rich veins and pockets are common. Diamond, positively identified on the basis of its cathodoluminescence, constitutes abundant small grains only within carbonaceous areas. Graphite lamellae, generally deformed, are completely devoid of diamond. Shock deformation is high and varies in different clasts. Weathering is minor. Specimens: main mass, 2.82 g, one thin section, MNA-SI, one thin section, OU.

Data from:
  Table 3
  Line 4:
Date:10 Jan 1991
Mass (g):3.19
Classifier:A. Burroni and L. Folco, MNA-SI; magnetic classification, P. Rochette, CEREGE and L. Folco MNA-SI according to Rochette et al. (2003)
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
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)
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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     Catalogue of Meteorites:   (72° 59' 27"S, 160° 22' 33"E)
     Recommended::   (72° 57' 20"S, 160° 32' 16"E)
Note: the NHM and MetBase coordinates are 6.6 km apart

     This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names)
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