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| Frontier Mountain 90233 | |||||||||||||||||||
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| 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:  31.9 g | ||||||||||||||||||
| Classification history: |
This is 1 of 660 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||
| Writeup |
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: |
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| 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) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
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Geography:
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Statistics: This is 1 of 44547 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||
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| Also see: |
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| Revision history: |
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