psql: how to find out type of an index (hash, btree, ...)?

How can I tell in psql client what kind of index a particular index
is? Doing a \d indexname just says "index", not the kind (hash, btree,
...)

Created using, for instance:

    create index users_acctname on users(acctname)

Will this get me a btree?

thanks,
Michael
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