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Wolfkop
Basic information Name: Wolfkop
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2021
Country: South Africa
Mass:help 90.3 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  L5
Recommended:  L5    [explanation]

This is 1 of 8895 approved meteorites (plus 5 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 30 Jul 2023
Writeuphelp
Writeup from MB 112:

Wolfkop        29°42.546’S, 19°37.912’E

Northern Cape, South Africa

Find: 2021 Aug 27

Classification: Ordinary chondrite (L5)

History: A single stone discovered by G.F. Lombaard while farming. Brought to attention of R. Gibson via G. Goncalves (USP).

Physical characteristics: A 90.26 g weakly magnetic stone with flattened tetrahedral shape, 7x4.5x2 cm. Upper surfaces are covered by thin (<< 1 mm) brownish black fusion crust that has been chipped away in several shallow pits that expose dark brown oxidized interior; faces intersect in obtuse angles and edges are rounded. Basal surface lacks fusion crust and is formed by an irregular fracture at an acute angle to other faces; it exposes oxidized mid/dark brown granular-textured interior with sub-mm shiny metal flakes and a few <1 mm chondrules.

Petrography: (R.L. Gibson and L.D. Ashwal, Wits) Chondrules are mostly poorly defined, with only a few, large (1.0-2.3 mm) pyroxene-rich (RP, POP) types visible; mostly slightly flattened shapes, but with a few spherical examples present. Irregular metal and troilite grains are up to 0.3 mm in size, with metal showing variable Ni content. Mineralogy: high-Ca Pyx (5%) - low-Ca Pyx (7%) - Ol (70%) - Fsp (6%) - metal (9%) - troilite (3%) and trace chromite, phosphate. The matrix grain size of ~ 50 μm and elongate-polygonal grain shapes indicate significant metamorphic recrystallization. Planar fractures dominate over irregular fractures in Ol and Pyx; Ol shows mosaicism. Fsp shows undulose extinction, PDF and possible maskelynite. Displacements of ~0.1 mm occur along an irregular network of planar to curved fractures that host dark shock veins up to 1 mm wide.

Geochemistry: Mineral compositions and geochemistry: (R.L. Gibson and L.D. Ashwal, Wits) Ol: Fa25.1±0.6 (24.1-26.5; N=12); low-Ca Pyx: Fs21.1±0.2 (20.7-21.6; N=14), Wo1.5±0.2 (1.1-1.8; N=14); high-Ca Pyx: Fs8.1±0.4 (7.2-8.8; N=10), Wo46.7±0.4 (44.7-47.2; N=10). Relatively homogeneous Ol and low-Ca Pyx indicate substantial reequilibration.

Classification: Ordinary chondrite (L5), shock stage S4, weathering W2

Specimens: Type specimen (Wits) 82.54 g; cut surface exposes metal flakes up to 2 mm in length in variably weathered (light to dark brown) matrix; remaining surfaces largely intact fusion crust, except for several shallow cm-wide chips. Polished thin section and 1.73 g offcut.

Data from:
  MB112
  Table 0
  Line 0:
State/Prov/County:Northern Cape
Origin or pseudonym:Vegetation-free area of bare soil
Date:2021 Aug 27
Latitude:29°42.546'S
Longitude:19°37.912'E
Mass (g):90.26
Pieces:1
Class:L5
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):25.1±0.6 (24.1-26.5, N=14)
Ferrosilite (mol%):21.1±0.2 (20.7-21.6, N=14)
Wollastonite (mol%):1.5±0.2 (1.1-1.8, N=14)
Classifier:R.L. Gibson and L.D. Ashwal, Wits
Type spec mass (g):82.54
Type spec location:Wits
Main mass:Wits
Finder:G.F. Lombaard
Comments:Specimen found by G.F. Lombaard within 1 km of meteorite specimen Brierskop. Meteorites Wolfkop and Brierskop are not paired.; submitted by Roger L. Gibson; Lewis D. Ashwal
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' 33"S, 19° 37' 55"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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