令人惊叹的月球长石角砾岩切片 盖尔达伊亚001!! - 13.9 g
编号 84454371
阿巴德拉 004,威诺奈特。新分类。 无保留价。 - 9.09 g - (1)
编号 84454371
阿巴德拉 004,威诺奈特。新分类。 无保留价。 - 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.