アカプルコ石隕石（NWA 16397）. 極めて珍しい隕石。 - 0.54 g
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Acapulcoite meteorite (NWA 16397) is an extremely rare meteorite from Western Sahara in Northwest Africa, weighing 0.54 g.
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Description from the seller
Northwest Africa 16397 (NWA 16397)
Purchased: 2022 Oct
Classification: Primitive achondrite (Acapulcoite)
History: Reportedly this stone was found in Western Sahara
Petrography: (K. Metzler, IfP) Recrystallized rock with abundant 120° triple junctions, consisting of olivine, low-Ca pyroxene, Ca-rich pyroxene, plagioclase, and Fe-Ni metal. Accessory phases are troilite, Cr-spinel and merrillite. Silicate grain sizes are mostly between 100 and 200 µm.
Geochemistry: Mineral compositions and geochemistry: Mean olivine composition: Fa8.3±0.2 (Fa7.9-8.5); Fe/Mn (at.): 15.5; n=10. Mean low-Ca pyroxene composition: Fs8.4±0.2 Wo1.8±0.6 (Fs8.0-8.8 Wo0.8-2.6); Fe/Mn (at.): 10.7; n=11. Mean composition of Ca-rich pyroxene: Fs3.5±0.3 Wo44.0±0.7 (Fs3.1-4.3 Wo42.0-44.6); Fe/Mn (at.): 11.2; n=11. Mean feldspar composition: An14.2±1.2 Or2.4±0.4 (An12.4-15.8 Or1.7-3.0); n=11.
Classification: Acapulcoite, based on mineralogy, mineral chemistry and mean grain size of silicates.
Shock stage:\tM-S1
Weathering grade:\tLow
Classifier: K. Metzler, IfP.
This lot has no reserve price and comes with its certificate of authenticity.
Thanks for your interest.
Northwest Africa 16397 (NWA 16397)
Purchased: 2022 Oct
Classification: Primitive achondrite (Acapulcoite)
History: Reportedly this stone was found in Western Sahara
Petrography: (K. Metzler, IfP) Recrystallized rock with abundant 120° triple junctions, consisting of olivine, low-Ca pyroxene, Ca-rich pyroxene, plagioclase, and Fe-Ni metal. Accessory phases are troilite, Cr-spinel and merrillite. Silicate grain sizes are mostly between 100 and 200 µm.
Geochemistry: Mineral compositions and geochemistry: Mean olivine composition: Fa8.3±0.2 (Fa7.9-8.5); Fe/Mn (at.): 15.5; n=10. Mean low-Ca pyroxene composition: Fs8.4±0.2 Wo1.8±0.6 (Fs8.0-8.8 Wo0.8-2.6); Fe/Mn (at.): 10.7; n=11. Mean composition of Ca-rich pyroxene: Fs3.5±0.3 Wo44.0±0.7 (Fs3.1-4.3 Wo42.0-44.6); Fe/Mn (at.): 11.2; n=11. Mean feldspar composition: An14.2±1.2 Or2.4±0.4 (An12.4-15.8 Or1.7-3.0); n=11.
Classification: Acapulcoite, based on mineralogy, mineral chemistry and mean grain size of silicates.
Shock stage:\tM-S1
Weathering grade:\tLow
Classifier: K. Metzler, IfP.
This lot has no reserve price and comes with its certificate of authenticity.
Thanks for your interest.
Details
隕石の名前
Acapulcoite meteorite (NWA 16397).
隕石の種類
Extremely rare meteorite.
付録
Do not reserve price.
重量
0.54 g
産地 (地域/都市)
Western Sahara
原産国
NWA
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