NWA 13545 - 高度再結晶的花崗質鋰輝石無球粒隕石與流線 - 12000 g - (1)

由Francesco Moser精選

Northwest Africa 13545 (NWA 13545) (Northwest Africa) Purchased: 2020 Classification: HED achondrite (Eucrite) History: The meteorite was purchased from a dealer in Algeria. Physical characteristics: Light brownish fragment with some fusion crust. Petrography: The meteorite is an unbrecciated medium-grained basalt predominantly composed of exsolved pyroxene (average grain sizes of about 400 μm) and larger, often lath-shaped calcic plagioclase (average grain sizes of about 800 μm). Minor phases include silica, chromite, troilite ; no metallic iron has been detected. Geochemistry: low-Ca pyroxene: Fs58.4±0.5Wo6.1±0.6 (Fs57.7-59.3Wo5.3-7.0, n=16, FeO/MnO=27-30); Ca-pyroxene: Fs29.7±0.1Wo41.2±0.2 (Fs29.5-30.0Wo40.9-41.5, n=12, FeO/MnO=29-32); calcic plagioclase: An89.5±0.4 (An88.9-90.5, n=13)

編號 83949169

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NWA 13545 - 高度再結晶的花崗質鋰輝石無球粒隕石與流線 - 12000 g - (1)

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Northwest Africa 13545 (NWA 13545)

(Northwest Africa)

Purchased: 2020

Classification: HED achondrite (Eucrite)

History: The meteorite was purchased from a dealer in Algeria.

Physical characteristics: Light brownish fragment with some fusion crust.

Petrography: The meteorite is an unbrecciated medium-grained basalt predominantly composed of exsolved pyroxene (average grain sizes of about 400 μm) and larger, often lath-shaped calcic plagioclase (average grain sizes of about 800 μm). Minor phases include silica, chromite, troilite ; no metallic iron has been detected.

Geochemistry: low-Ca pyroxene: Fs58.4±0.5Wo6.1±0.6 (Fs57.7-59.3Wo5.3-7.0, n=16, FeO/MnO=27-30); Ca-pyroxene: Fs29.7±0.1Wo41.2±0.2 (Fs29.5-30.0Wo40.9-41.5, n=12, FeO/MnO=29-32); calcic plagioclase: An89.5±0.4 (An88.9-90.5, n=13)