The Meteoritical Bulletin, No. 100
Purchased: 2011 Mar
Mass: 466 g
meteorite (feldspathic breccia)
Reported to be found near Tandouf, Algeria, in
February 2011, and purchased from a dealer in Zagora, Morocco by Peter Utas in March 2011.
characteristics: A single stone (466 g) with partial
fusion crust. About two-thirds of the stone consists of a fragmental
breccia composed of a variety of lighter colored, mostly angular mineral
and rock clasts in a dark-gray matrix. The other one-third of the stone is
comprised of a single large (to 4 cm), light-gray, fine-grained clast
(which itself contains small remnant clasts).
Irving and S. Kuehner, UWS) The
large, light-gray clast contains sparsely-distributed angular grains of
olivine and calcic plagioclase set in a melt-textured (intersertal)
aggregate of calcic plagioclase and both low-Ca and high-Ca pyroxenes, with
accessory skeletal ilmenite, armalcolite, fayalite, troilite, silica
polymorph, baddeleyite, merrillite, kamacite and rare zircon. The complex
dark matrix portion consists of angular grains of olivine, low-Ca pyroxene,
calcic plagioclase, Ti-bearing chromite, silica polymorph, silica+K-feldspar intergrowths, kamacite,
feldspar-rich clasts (including additional melt-textured clasts), and sparse
glass fragments containing tiny vesicles.
Olivine (Fa40.6-47.6, Fe/Mn=114-117), low-Ca pyroxene (Fs22.8-28.8Wo5.9-6.5,
Fe/Mn=52-61), high-Ca pyroxene (Fs26.4-28.8Wo22.2-18.3,
Fe/Mn=58-74), plagioclase (An91.5-94.8Or0.4-0.2).
Achondrite (lunar, feldspathic breccia). Terrestrial weathering is minimal.
Specimens: A total of 21.6 g of sample is on deposit at UWS. The
main mass is held by Peter Utas.