Feldspar waa nooc ka mid ah macdanta oo ka tirsan kooxda macdanta dhagaxa samaysa. Waa macdan caadi ah oo laga helo noocyo badan oo dhagaxyo ah, oo ay ku jiraan granite, gneiss, iyo basalt. Feldspar inta badan waa caddaan ama midab cirro leh, laakiin sidoo kale waxaa laga heli karaa midabyo kale, sida casaan, jaalle, ama cagaar. Waxay ka kooban tahay silicate aluminium, potassium, sodium, iyo calcium. Feldspar waxa loo isticmaalaa soo saarista dhoobada, dhalooyinka, iyo buuxinta alaabta kala duwan.