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Northwest Africa 12855 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12855 This is an OFFICIAL meteorite name. Abbreviation: NWA 12855 Observed fall: No Year found: 2014 Country: (Northwest Africa) Mass: 224 g | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 709 approved meteorites (plus 2 unapproved names) classified as H3. [show all] Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||||
Comments: | Approved 9 Aug 2019 | ||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12855 (NWA 12855) (Northwest Africa) Purchased: 2014 Classification: Ordinary chondrite (H3) History: Collected by nomads in Western Sahara and purchased by Parco Astronomico delle Madonie from Giorgio Tomelleri in 2018. Physical characteristics: A black crust-covered single piece weighing 224 g. Several well-formed chondrules are visible on the cut surface Petrography: (V. Moggi Cecchi, G. Pratesi, UniFi); A marked chondritic texture is visible in the thin section displays, with PO, PP and POP chondrules ranging from 300 to 1200 μm in a fine grained matrix. Olivine and orthopyroxene crystals PO and POP chondrules are inhomogenesous, with a slight core-rim variability. Olivine is more Fe-rich in the matrix. Opaque phases are diffuse and mainly represented by iron oxides, Fe-Ni alloys and troilite as individual grains scattared in the matrix or rimming chondrules. Geochemistry: EMP (V. Moggi Cecchi, G. Pratesi, UniFi); Olivine (Fa12.4±9.5Fo87.6±5.5; Fe/Mn = 42.0, n=24 ); Orthopyroxene in chondrules’ grains and in matrix (Fs10.4±6.9En88.5±3.3Wo0.9±0.1, Fe/Mn = 25.2, n=15); Classification: Ordinary Chondrite (H3); S1; W3 Specimens: A total of 20.1 g specimen is on deposit at MSN-FI. Parco Astronomico delle Madonie holds the main mass. | ||||||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
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Institutions and collections |
MSN-FI: Museo di Storia Naturale “La Specola”, Sez. Mineralogia – Sistema Museale dell'Università degli Studi di Firenze
Via Giorgio La Pira, 4 – 50121 Firenze, Italy; Website (institutional address; updated 24 Oct 2022) UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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