Chondrites are extraordinary mixtures of materials with diverse origins that formed around other stars, in the solar nebula, and in their parent asteroids. Most chondrites were so severely altered by aqueous fluids, thermal metamorphism, and impacts that the original characteristics of their components have been largely erased. But a few pristine chondrites have preserved an exquisite mineralogical, chemical, isotopic, and chronological record of the first few million years of solar system history. The properties of diverse types of carbonaceous, ordinary, and enstatite chondrites focusing on the most pristine samples are reviewed to establish the chemical, isotopic, and mineralogical properties and origins of their components and to elucidate the asteroidal processes that modified them. Refractory inclusions – amoeboid olivine aggregates and Ca–Al-rich inclusions – were the first solids to form in the solar nebula near to the protosun. Chondrules and associated metallic Fe–Ni grains were still forming several million years later when the earliest planetesimals, which melted due to heat from 26 Al decay, were colliding. In the least-altered chondrites, matrix material, which coats chondrules and other components, is largely composed of micrometer-sized silicates and amorphous materials, which formed at high temperatures, plus small amounts (up to 200 ppm) of presolar oxides and silicates.

Chondrites and Their Components

http://zolotov.faculty.asu.edu/publ/Zolotov-fluids-2012.pdf

Aqueous fluid composition in CI chondritic materials: Chemical equilibrium assessments in closed systems

Iron‐rich olivine in the unequilibrated ordinary chondrite, MET 00526: Earliest stages of formation

http://www.geology.wisc.edu/~wiscsims/pdfs/Tenner_GCA2013.pdf

Oxygen isotope systematics of chondrule phenocrysts from the CO3.0 chondrite Yamato 81020: Evidence for two distinct oxygen isotope reservoirs

Origin of ferroan olivine in matrices of unequilibrated chondrites.

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Origin of ferroan olivine in matrices of unequilibrated chondrites.