Oracle: Order of invisible columns

create table tq84_invis_col (
    col_a      number,
    col_b      number      invisible,
    col_c      number
);

insert into tq84_invis_col (col_a, col_b, col_c) values (1, 2, 3);

select
   col.column_id,
   col.column_name,
   col.data_type
from
   user_tab_columns col
where
   col.table_name = 'TQ84_INVIS_COL'
order by
   col.column_name;
--
-- COLUMN_ID  COLUMN_NAME  DATA_TYPE 
-- ---------  -----------  ---------
--         1  COL_A        NUMBER    
--            COL_B        NUMBER    
--         2  COL_C        NUMBER    

alter table    tq84_invis_col modify col_b visible;

select * from tq84_invis_col;
-- 
--      COL_A      COL_C      COL_B
-- ---------- ---------- ----------
--          1          3          2

drop table tq84_invis_col;