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Subdivision of meteorites
- Primitive achondrites are a subdivision of meteorites. They are classified on the same rank (historically called "Class") and lying between chondrites and achondrites. They are called primitive because they are achondrites that have retained much of their original chondritic properties.
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Primitive achondrites are a subdivision of meteorites. They are classified on the same rank (historically called "Class") and lying between chondrites and achondrites. They are called primitive because they are achondrites that have retained much of their original chondritic properties.
- Heterogeneous
- Achondrite
- Various
Mar 15, 2023 · Primitive achondrites, representing ‘transitional’ samples between chondrites and differentiated achondrites, provide a great opportunity to decode the thermal histories of planetesimals in the early solar system.
May 15, 2020 · Primitive achondrites were initially defined as having bulk chemical compositions similar to chondrites but textures indicative of high temperature equilibration and limited extents of igneous processing.
- Max Collinet, Timothy L. Grove
- 2020
Mar 3, 2017 · Primitive achondrites experienced partial melting and preserve isotopic and some chemical signatures of their precursor chondritic materials (Figure 1 ). They include the acapulcoite-lodranite clan, the winonaites and silicate inclusions in IAB-IIICD irons, achondritic inclusions in IIE irons, brachinites, and ureilites.
Primitive achondrites are a remarkable family of meteorites, marking the transition between unmolten chondrites and fully differentiated achondrites ( Fig. 1 ). As such, these meteorites sampled partially melted planetesimals, formed only a few million years (My) after the formation of the first solids in the Solar System.
A primitive cell is a unit cell that contains exactly one lattice point. It is the smallest possible cell. [5] . If there is a lattice point at the edge of a cell and thus shared with another cell, it is only counted half. Accordingly, a point located on the corner of a cube is shared by 8 cubes and would count with 1 8 1 8 . Wigner-Seitz Cell.
Oct 3, 2022 · Tafassasset is an unusual primitive achondrite. It contains predominantly FeO-rich olivine (Fa 29), pyroxene (Fs 26) and intermediate plagioclase in coexistence with abundant Fe-Ni metal. Tafassasset was initially suggested to be an equilibrated CR achondrite based on its oxygen isotopic composition.
