Felspar is a generic term which embraces a number of species, such as orthoclase or potash-felspar, albite or soda-felspar, and anorthite or lime-felspar.
"Geology"
James Geikie
0.95 0.30 10.32 3.42 W 0.44 2.55. albite.
"The Student's Elements of Geology"
Sir Charles Lyell