单词	achondrite
释义	achondrite /əˈkɒndrʌɪt / noun A stony meteorite containing no small mineral granules (chondrules).Stones are divided into two main subcategories: chondrites and achondrites.... It has been identified in carbonaceous achondrite and iron meteorites. There are a number of other achondrites that do not fit into any of the preceding groups or subgroups. Derivatives achondritic adjective ... Stony-irons would then be samples from the boundary between the achondritic upper layers and the core. While still on the parent body, much of the achondritic material was formed by igneous processes similar to those occurring on Earth today. This means there are a lot of different groups and sub-types of iron meteorite and they can be related to both stony achondritic and chondrite meteorites. Origin Early 20th century: from a-1 'without' + chondrite.
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