II 90% , II (Tolansky, 1969).

, I . , , .

- , Si, Al, Ca, Mg Mn. Na, Ba, Cu, Fe, , Cr Ti. (, , ), Fe , a Ti . : Sr, Co, Zr, P, Sc, La, Lu, Pt, Ag, Au Pb . ; .

I II, , . (Chesley, 1942) , , II, ,