It's possible you are thinking of Jabir ibn Hayyan, a prominent 8th-century alchemist and polymath who is often called the "father of chemistry." He is known for his extensive writings on alchemy, chemistry, and other scientific subjects. However, the exact number of books attributed to him is debatable, with estimates ranging from 10 to 200 depending on how works are defined and categorized.
It's important to note that many of the texts attributed to Jabir ibn Hayyan are likely later compilations or revisions, making it difficult to determine the exact number of books he personally authored.