How do I find out the size of a index

Hi,

I can use "select blocks*8 from dba_tables where table_name='ABC'" to find out the size of a table.
How do I find out the size of a index? I do not see a column BLOCK in dba_indexes.

Thanks,

Roger Xu
Database Administrator
Dr Pepper Bottling Company of Texas
(972)721-8337

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