what is the type of lithium when rubidium is nabr (1.9)?
CREATE TABLE table_name_54 (lithium VARCHAR, rubidium VARCHAR)
SELECT lithium FROM table_name_54 WHERE rubidium = "nabr (1.9)"
### Context: CREATE TABLE table_name_54 (lithium VARCHAR, rubidium VARCHAR) ### Question: what is the type of lithium when rubidium is nabr (1.9)? ### Answer: SELECT lithium FROM table_name_54 WHERE rubidium = "nabr (1.9)"