CREATE TABLE table_name_13 (name_of_the_stone__sila_ VARCHAR, name_of_the_state_where_found_in_india VARCHAR)

What is the name of the stone found in Andhra Pradesh, India?
SELECT name_of_the_stone__sila_ FROM table_name_13 WHERE name_of_the_state_where_found_in_india = "andhra pradesh"
SELECT "name_of_the_stone__sila_" FROM "table_name_13" WHERE "andhra pradesh" = "name_of_the_state_where_found_in_india"