mosaicized ureilite | | very slow | | completely shattered or mosaicized | | | 100 GPa or greater | | AURE | mottled by melt glass | | asteroid | partial melting residue | no chondrules | | | | | cooling in deep underground chambers | | coarse-grained granular | | | visible via dark matrix outlining relict grain boundaries of large, elongate grains, and a common preferred orientation of grains within relict domains -has source: Berkley JL, Taylor GJ, Keil K. Harlow GE, Prinz M 1980, Geochim Cosmochim Acta 44, 1579 -has URL: http://adsabs.harvard.edu/cgi-bin/bib_query?1980GeCoA..44.1579B | 6 (out of date) | | | | olivine-pigeonite about 90% by volume | | diamonds and/or lonsdaleite | | | | much less than 1 mm | | carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume | olivine, pyroxene (some combination of pigeonite, orthopyroxene, augite) | 9 kg (out of date) | | | | mosaicized | reduced rims contacting carbonaceous matrix material 0.1 mm FeO-free olivine and/or enstatite rims riddled with tiny inclusions of low-Ni metal | |
shock melted chondrite | in weight % | | in weight % | impact melt and melt breccias | fine grained disequilibrium mixture of silicates, oxides, metal, sulfides and organic constituents | the nature and degree of thermal metamorphism or aqueous alteration | greater than 90 GPa | in volume % | | | agglomeration of particles, many of which record individual, diverse histories | meteoroid from interplanetary space or fragment dislodged from another planet, moon or planetesimal | | | providing insight into geological evolution of parent asteroid | usually plagioclase tectosilicate | in volume % | in volume % | | millimeters | | | oldest and most primitive rock in solar system | | 1691 | in weight % | impact melt and melt breccias | impact melt and melt breccias | | less than 950 degree Celsius during its entire history since solidification | orthopyroxene for enstatite chondrite | before, during or after other types of metamorphism | in weight % | definition goes here | | definition goes here | | | 485755 kg | in volume % | asteroid smaller than 100 km in diameter | small sphere of about 1 mm diameter of formerly melted minerals | | | which depends on degree of aqueous alteration and thermal metamorphism |