4) what kinds of features indicate that the achondrites are igneous rocks?

Explanation:

The formation of achondrites is similar to the formation of igneous rocks .

As , both are formed via the process of crystallization and the process of solidification of the molten rock , and the features which indicates  ,

that the achondrites are the igneous rocks are its distinct texture and the mineralogies .  

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answer called a epicycle;