NWA 15788 HED 无球粒陨石 迪奥日尼特 多元砾岩陨石 無粒隕石 - 18.77 g - (1)

NWA 15788 HED Achondrite Diogenite polymict breccia meteorite.
Found in November 2022
In Kidal region Mali
18.77 grams.

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Northwest Africa 15788 (NWA 15788)

(Northwest Africa)


Classification: HED achondrite (Diogenite, polymict)


OFFICIAL CLASSIFICATION DATA SOURCE:
Petrography: (A. Irving, UWS, and P. Carpenter, WUSL) Breccia composed predominantly crystalline debris derived from diogenites (zoned low-Ca pyroxene, anorthite and Ti-free chromite) with vol.% of eucritic material (as grains of exsolved pigeonite, labradorite, ilmenite and symplectitic intergrowths composed of silica polymorph+fayalite+hedenbergite). Minor kamacite and secondary Fe oxide are also present.

Geochemistry: Orthopyroxene cores (Fs23.2-26.5Wo1.8, FeO/MnO = 31-34, N = 2), pigeonite rims (Fs33.6-34.8Wo8.2-6.8, FeO/MnO = 28-30, N = 2), ferroan pigeonite rim (Fs53.3Wo15.7, FeO/MnO = 35), subcalcic augite (Fs44.0Wo25.5, FeO/MnO = 31), low-Ca pyroxene hosts (Fs55.3-63.4Wo3.9-5.2; Fs39.0Wo5.1; FeO/MnO = 30-34, N = 3), augite exsolution lamellae (Fs28.8-28.9Wo40.5-41.6; Fs19.3Wo41.3; FeO/MnO = 29-33, N = 3), hedenbergite (Fs58.7Wo33.1, FeO/MnO = 42), fayalite (Fs82.7, FeO/MnO = 43), labradorite (An65.0-69.9Or1.4-1.7, N = 2), anorthite (An93.6-94.6Or0.2, N = 2).

Classification: Diogenite (polymict breccia).

Data from:
MB112
Table 0
Line 0:
Place of purchase: Mali
Date: P 2022 Nov
Mass (g): 3912
Pieces: many
Class: Diogenite-pm
Shock stage: low
Weathering grade: low
Fayalite (mol%): 82.7
Ferrosilite (mol%): 23.2-26.5; 33.6-34.8; 55.3-63.4; 28.6-28.9
Wollastonite (mol%): 1.8±0.0; 8.2-6.8; 3.9-5.2; 40.5-41.6
Classifier: (A. Irving, UWS, and P. Carpenter, WUSL)
Type spec mass (g): 25.9
Type spec location: UWB