Salivary gland stone. X-ray of the jaw of a 36-year-old patient with a stone (white, lower left) in the right submaxillary gland. The appearance of stones (calculi) in the salivary glands is known as sialolithiasis. The formation of stones (lithiasis) in any organ, such as gallstones and kidney stones, occurs when mineral salts precipitate out of solution and clump together.