Acapulcoite | NWA 12892 | Primitive Achondrite

Full slice of NWA 12892, Acapulcoite meteorite

Meteorite Name: Northwest Africa 12892
Abbreviation: NWA 12892
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Main Mass: 24.88 g.

Specimen description:

Type, group, subgroup: Stone, Primitive Achondrite, Acapulcoite

Specimen Weight: 2.00 grams

Approximate Measurements: 24 mm x 24 mm x 1.2 mm

Full slice.

Elegant slices worthy of any collection.
Arrives with a certificate of authenticity. IMCA #6460

Note: The meteorite is sold without the scale cube.

Physical characteristics: Single dark-brown stone with minor fusion crust.

Petrography: (D. Sheikh, FSU) Sample is highly recrystallized and contains abundant 120° triple junctions. Silicate major phases include angular to sub-rounded grains (Av. 180 μm) of olivine, low-ca pyroxene, high-ca pyroxene, and plagioclase. Fe-Ni metal grains (mostly kamacite, Av. 500 μm) occupy ~10% volume of the sample. Other phases include troilite, chromite, fluorapatite, and merrillite.

Geochemistry: (D. Sheikh, FSU) Olivine (Fa_8.9±0.3, range Fa_8.3-9.7, Fe/Mn=17±4, n=32), low-Ca Pyroxene (Fs_9.8±0.3Wo_2.5±0.4, range Fs_9.3-10.4Wo_1.7-3.1, Fe/Mn=11±2, n=26), high-Ca Pyroxene (Fs_4.1±0.2Wo_42.5±2.6, range Fs_3.8-4.3Wo_38.7-44.3, Cr₂O₃ 1.4 wt%, Fe/Mn=6±1, n=4), plagioclase (An_19.5±0.8Or_2.5±0.4, range An_18.7-20.4Or_2.0-3.0, n=5), Chromite (Cr/(Cr Al)=86.9, n=2), Kamacite (Ni wt%=6.6, n=11).