Fantastisk stykke månefeltspatisk breccia Ghardaia 001!! - 13.9 g
Nr. 84454371
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Abadla 004, Winonaite. Ny klassifisering. Ingen reservasjonspris. - 9.09 g - (1)
Abadla 004 30.873960N, 2.802016W
Bechar, Algeria
Purchased: 2023
Classification: Primitive achondrite (Winonaite)
History: Purchased by Sahrawi meteorit hunters in Abadla, Algeria.
Petrography: (K. Metzler, IfP) Achondrite with metamorphic texture, showing frequent 120° triple junctions and partly poikilitic intergrowths. It consists of forsterite, enstatite, diopside, plagioclase, and Fe-Ni metal. Much of the latter is terrestrially oxidized, forming veins of alteration products along grain boundaries and crosscutting mineral grains. Typical grain sizes vary between 200 and 500 µm. Accessories are troilite, schreibersite, and daubréelite.
Geochemistry: Mineral compositions and geochemistry: Mean olivine composition: Fa0.2±0.1 (Fa0.1-0.2); Fe/Mn (at.): 1.4; n=8. Mean low-Ca pyroxene composition: Fs0.6±0.1Wo2.1±0.2 (Fs0.4-0.8Wo1.8-2.4); Fe/Mn (at.): 0.7; n=6. Mean composition of Ca-rich pyroxene: Fs0.7±0.6Wo44.3±0.6 (Fs0.3-1.7Wo43.5-44.8); Fe/Mn (at.): 1.7; n=5. Mean feldspar composition: An9.4±0.5Or3.9±0.3 (An8.7-9.8Or3.7-4.3); n=5
Classification: Winonaite, based on texture and mineral chemistry.
Shock stage: M-S1
Weathering grade: Moderate.
Classifier: K. Metzler, IfP
This lot comes with certificate of authenticity.
Thanks for your interest.
Nr. 84454371
Solgt
Abadla 004, Winonaite. Ny klassifisering. Ingen reservasjonspris. - 9.09 g - (1)
Abadla 004 30.873960N, 2.802016W
Bechar, Algeria
Purchased: 2023
Classification: Primitive achondrite (Winonaite)
History: Purchased by Sahrawi meteorit hunters in Abadla, Algeria.
Petrography: (K. Metzler, IfP) Achondrite with metamorphic texture, showing frequent 120° triple junctions and partly poikilitic intergrowths. It consists of forsterite, enstatite, diopside, plagioclase, and Fe-Ni metal. Much of the latter is terrestrially oxidized, forming veins of alteration products along grain boundaries and crosscutting mineral grains. Typical grain sizes vary between 200 and 500 µm. Accessories are troilite, schreibersite, and daubréelite.
Geochemistry: Mineral compositions and geochemistry: Mean olivine composition: Fa0.2±0.1 (Fa0.1-0.2); Fe/Mn (at.): 1.4; n=8. Mean low-Ca pyroxene composition: Fs0.6±0.1Wo2.1±0.2 (Fs0.4-0.8Wo1.8-2.4); Fe/Mn (at.): 0.7; n=6. Mean composition of Ca-rich pyroxene: Fs0.7±0.6Wo44.3±0.6 (Fs0.3-1.7Wo43.5-44.8); Fe/Mn (at.): 1.7; n=5. Mean feldspar composition: An9.4±0.5Or3.9±0.3 (An8.7-9.8Or3.7-4.3); n=5
Classification: Winonaite, based on texture and mineral chemistry.
Shock stage: M-S1
Weathering grade: Moderate.
Classifier: K. Metzler, IfP
This lot comes with certificate of authenticity.
Thanks for your interest.
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