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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.
Jun 1, 2023 · Primitive achondrites are subdivided into different groups on the basis of their petrologies and chemical and isotopic compositions, including the acapulcoites–lodranites, winonaites, brachinites, and ureilites ( Krot et al. 2014 ).
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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.
Mar 3, 2017 · Asteroidal achondrites are broadly classified into primitive and differentiated types. Primitive achondrites experienced partial melting and preserve isotopic and some chemical signatures of their precursor chondritic materials (Figure 1).
The primitive achondrites include the acapulcoites, brachinites, lodranites, winonaites, and ureilites. They are achondrite meteorites that retain chondrite characteristics such as relict chondrules and chemical composition as the result of extensive recrystallization or partial melting.
Primitive achondrites, such as acapulcoites, lodranites, winonaites, and brachinites, are considered to be the products of the earliest stages of melting and igneous processing on planetesimals (Mittlefehldt et al., 1998, and references therein).
Nov 24, 2022 · There are an infinite number of primitive cells, but materials scientists typically use one of two types: the conventional primitive lattice has ⅛ of a lattice point at each corner of a parallelepiped, and the Wigner-Seitz primitive cell has a lattice point at the center of each polyhedron.
