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Brierskop
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:help 21.2 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  H4
Recommended:  H4    [explanation]

This is 1 of 6528 approved meteorites (plus 3 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
Writeuphelp
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:
State/Prov/County:Northern Cape
Origin or pseudonym:sand alongside a dry watercourse
Date:18 Sept 2019
Latitude:29°42.917'S
Longitude:19°38.436'E
Mass (g):21.19
Pieces:1
Class:H4
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):18.8±0.4 (18.0-19.6, N=12)
Ferrosilite (mol%):16.7±0.5 (16.1-18.0; N=17)
Wollastonite (mol%):1.2±0.1 (0.9-1.5; N=17)
Classifier:R.L. Gibson and L.D. Ashwal, Wits; G. Goncalves, USP
Type spec mass (g):10.85
Type spec location:Wits
Main mass:Wits
Finder:G.F. Lombaard
Comments:Specimen found by G.F. Lombaard within 1 km of meteorite specimen Wolfkop. Meteorites Brierskop and Wolfkop are not paired.; submitted by Roger L. Gibson; Lewis D. Ashwal; G. Goncalves
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 16 Feb 2024)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Geography:

South Africa
Coordinates:
     Recommended::   (29° 42' 55"S, 19° 38' 26"E)

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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