NWA 4473 – about 0.5g

$13.00

1 in stock

Description

Diogenite polymict.

Slice.
Sold in membrane box with label/certificate of authenticity.


Northwest Africa 4473

Northwest Africa

Find: July 2006

Achondrite (diogenite)

History: G. Hupé purchased a total of 32 dark stones in July 2006 in Laâyoune, Morocco.

Physical characteristics: Cut-surfaces of the stones show pale yellowish-green angular clasts (see figure) and have a combined weight of 7020 g. No fusion crust was noted for any of the specimens.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of polycrystalline clasts (≤ 2 cm) set in a matrix derived from several different diogenite precursors. No basaltic eucrite clasts were observed. The sample is modally dominated by orthopyroxene with subordinate olivine, augite, chromite, silica polymorph, rare calcic plagioclase, troilite, pyrrhotite and kamacite.

Mineral compositions: Orthopyroxene compositions fall into at least three distinct populations (median compositions): Fs17.2Wo1.0, FeO/MnO = 34.4; Fs21.6Wo2.1, FeO/MnO = 29.3; Fs37.2Wo3.5, FeO/MnO = 32.6). Olivine (Fa24.5, FeO/MnO = 50.2).

Classification: Achondrite (diogenite).

Specimens: A total of 20.1 g of sample and one polished mount are on deposit at UWS. GHupé holds the main mass.