Which material has a hardness of 8.25?
CREATE TABLE table_7700 (
    "Material" text,
    "Formula" text,
    "Refractive index(es) 589.3nm" text,
    "Hardness ( Mohs' scale )" text,
    "Density (g/cm 3 )" text,
    "State of the art" text
)
SELECT "Material" FROM table_7700 WHERE "Hardness ( Mohs' scale )" = '8.25'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which material has a hardness of 8.25? ### Input: CREATE TABLE table_7700 (
    "Material" text,
    "Formula" text,
    "Refractive index(es) 589.3nm" text,
    "Hardness ( Mohs' scale )" text,
    "Density (g/cm 3 )" text,
    "State of the art" text
) ### Response: SELECT "Material" FROM table_7700 WHERE "Hardness ( Mohs' scale )" = '8.25'