However, it's important to note that the specific gravity can vary slightly depending on the specific type of feldspar:

* Albite (NaAlSi3O8): 2.62

* Orthoclase (KAlSi3O8): 2.56

* Microcline (KAlSi3O8): 2.57

* Anorthite (CaAl2Si2O8): 2.76

These are just examples, and the specific gravity can be influenced by factors like mineral composition, impurities, and crystal structure.