Here's why:
* Feldspar is ancient: Humans have used feldspar for thousands of years in tools, pottery, and other crafts. It was likely recognized as a distinct material long before formal scientific classification.
* Many cultures likely knew of it: Different civilizations around the world would have encountered and utilized feldspar independently.
* Formal classification evolved: It was only with the development of mineralogy as a scientific field in the 18th century that feldspar was formally defined and classified.
While we can't attribute the "discovery" to a specific person, early mineralogists like Abraham Gottlob Werner and René Just Haüy played significant roles in defining and classifying feldspar as a mineral group.