Femic

Sum of femic normative minerals

[Di] + [Hy] + [Ol] + [Mt] + [Il] + [Hm]

CI

Crystallization Index [25]

[An] + 2.157[Di]-Mg + [Ol]-Mg + 0.7007 [Hy]-Fe

DI

Differentiation Index [26]

[Q] + [Or] + [Ab] + [Ne] + [Lc]

SI

Solidification Index [27]

100 × MgO/(MgO + FeO + Fe₂O₃ + Na₂O + K₂O)

AR

Alkalinity Ratio [28]

Al₂O₃ + CaO + 2Na₂O

Mg#

Mg-number [21]

100 × (Mg/(Fe + Mg))

Fe#

Fe-index [29]

FeO/(FeO + MgO)

MALI

Modified Alkali Lime Index [30]

Na₂O + K₂O-CaO

ACNK

Alumina-Saturation Index [31]

Al/(Ca-1.67P + Na + K)

ANK

Alumina Index [32]

Al/(Na + K)

AI

Alkalinity Index [31]

Al-(K-Na)

FSSI

Feldspathoid Silica-Saturation Index [33]

[Q]-([Lc] + 2([Ne] + [Kp]))/100

Density

Theoretical density of the rock

Sum of mineral densities