This usually occurs on ternary diagrams, where the relative proportions of three minerals are used to classify the rock.
2.
Examples of petrological methods include QFL ternary diagram, heavy mineral assemblages ( apatite-tourmaline index, garnet zircon index ), clay mineral assemblages and illite crystallinity, reworked fossils and palynomorphs, and stock magnetic properties.
3.
The difference between these two magma series can be seen on an AFM diagram, a ternary diagram showing the relative proportions of the oxides Na 2 O + K 2 O ( A ), FeO + Fe 2 O 3 ( F ), and MgO ( M ).
4.
The difference between these two magma series can be seen on an AFM diagram, a ternary diagram showing the relative proportions of the oxides of Na 2 O + K 2 O ( A ), FeO + Fe 2 O 3 ( F ), and MgO ( M ).
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