The most abundant matrix minerals in chondritic meteorites—hydrated phyllosilicates and ferrous olivine crystals—formed predominantly in asteroids during fluid-assisted metamorphism. We infer that they formed from minerals present in three less altered carbonaceous chondrites that have silicate matrices composed largely of micrometerand nanometer-sized grains of crystalline forsterite Mg2SiO4 a...

ABSTRACT We present the most detailed data-driven exploration of cloud opacity in a substellar object to-date. have tested over 60 combinations composition and structure, particle-size distribution, scattering model, gas phase assumptions against archival 1–15 ?m spectroscopy for unusually red L4.5 dwarf 2MASSW J2224438-015852 using Brewster retrieval framework. find that, within our framework,...

Oxygen isotopes were measured in four chondritic hydrated interplanetary dust particles (IDPs) and five chondritic anhydrous IDPs including two GEMS-rich particles (Glass embedded with metal and sulfides) by a combination of high precision and high lateral resolution ion microprobe techniques. All IDPs have isotopic compositions tightly clustered around that of solar system planetary materials....