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| Brierskop | |||||||||||||||||||||||||||||||||||||||
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| Basic information | Name: Brierskop This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2019 Country: South Africa Mass:  21.2 g | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 6459 approved meteorites (plus 2 unapproved names) classified as H4. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||||||||||
| Comments: | Approved 30 Jul 2023 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 112:
Brierskop 29°42.917’S, 19°38.436’E Northern Cape, South Africa Find: 18 Sept 2019 Classification: Ordinary chondrite (H4) History: A single stone found by G.F. Lombaard. Facebook post noted by G. Goncalves (USP), who acquired specimen and cut for thin section. Remaining main mass and a thin section forwarded to R. Gibson (Wits) for petrographic and EPMA analysis. Physical characteristics: A 21.19 g moderately to strongly magnetic stone with overall flattened rectangular shape, dimensions 3 × 2 × 1.5 cm. Brownish black fusion crust (<<1 mm thick) covers ~80%, smooth surface; surfaces are slightly curved and edges are rounded. Chipped corners reveal stone interior to be pale brown and granular, with several discrete mm-sized chondrules visible. Petrography: (R.L. Gibson and L.D. Ashwal, Wits; G. Goncalves, USP) Well-defined chondrules (0.1-1.6 mm, av. ~0.5 mm) with relatively well-defined rounded to slightly ellipsoidal shapes, comprise 70% of volume; POP, PP, PO, RP types dominate, also BO, GOP types. Metal + troilite constitute 15 vol% and form irregular grains up to 0.6 mm in size. Mineralogy: high-Ca Pyx (5%) - low-Ca Pyx (33%) - Ol (38%) - Fsp (7%) - metal (11%) - troilite (4%) - chromite (1%), and trace phosphate. Generally well-defined chondrules, <10 μm matrix and chondrule mesostasis grain size indicates only moderate metamorphism. Irregular fractures and undulose extinction in Ol and Pyx, with rare planar fractures, indicate low shock. Metals and sulfides display limited oxidation haloes. Geochemistry: Mineral compositions and geochemistry: (R.L. Gibson and L.D. Ashwal, Wits) Ol: Fa18.8±0.4 (Fa18.0-19.6; N=12); low-Ca Pyx: Fs16.8±0.5Wo1.2±0.1 (Fs16.1-18.0Wo0.9-1.5; N=17); high-Ca Pyx: Fs5.6±0.7Wo46.9±0.5 (Fs5.0-7.1Wo46.0-47.4; N=14). Classification: Ordinary chondrite (H4), shock stage S2, weathering W1 Specimens: Type specimen (Wits) 10.85 g, 2.1 × 1.5 × 1.5 cm; cut surface shows abundant mm-size metal grains; other surfaces mostly covered by fusion crust, except for a chipped edge. Thin section. Second specimen (USP) 2.94 g, and thin section. | ||||||||||||||||||||||||||||||||||||||
| Data from: MB112 Table 0 Line 0: |
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| Institutions and collections |
Wits: Curator of Fossil and Rock Collections
c/o Evolutionary Studies Institute
University of the Witwatersrand
Private Bag 3
WITS 2050
Johannesburg
South Africa, South Africa (institutional address; updated 3 May 2019) USP: Museu de Geociências - USP Rua do Lago, 562 CEP: 05508-080 Butantã - SP Brazil, Brazil; Website (institutional address; updated 22 Oct 2022) |
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| References: | Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Geography:
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Statistics: This is 1 of 11 approved meteorites from Northern Cape, South Africa (plus 1 unapproved name) This is 1 of 49 approved meteorites from South Africa (plus 2 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||||||||||
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