AMGALA 001 : Shergottite
Olivine-Phyric, Permafic

Latitude: 26.014°N
Longitude: 11.020°W
Mass (g): 34665
Pieces: many
Class: Martian (shergottite)
Shock stage: high
Weathering grade: low
Fayalite (mol%): 31.7-56.6
Ferrosilite (mol%): 27.7-48.4; 20.7-30.4
Wollastonite (mol%): 8.0-10.4; 32.5-34.6
Classifier: (A. Irving, UWS, and P. Carpenter, WUSL)

Meteoritical Society Database

Petrography: (A. Irving, UWS, and P. Carpenter, WUSL) Zoned olivine phenocrysts (up to 2 mm in length) are set in a groundmass with variable grainsize composed predominantly of prismatic, zoned clinopyroxene and lath-like maskelynite, together with accessory alkali feldspar, pyrrhotite, ulvöspinel, chromite (with variable Ti content), ilmenite, baddeleyite and chlorapatite. Thin opaque shock veins crosscut the specimen as well as secondary calcite veinlets. Olivine phenocrysts contain small patches of alteration products (red-brown in thin section).

Geochemistry: Olivine (Fa31.7-56.6, FeO/MnO = 52-55, N = 5), pigeonite (Fs27.7-48.4Wo10.4-9.8, FeO/MnO = 29-35, N = 3), subcalcic augite (Fs20.7-30.4Wo32.5-34.6, FeO/MnO = 28-32, N = 2), maskelynite (An47.4-50.5Or2.2-1.7, N = 2), alkali feldspar (Ab49.4Or34.0An16.7).

Classification: Shergottite (olivine-phyric).