The comparison of the ways in which iron-magnesium minerals and feldspars crystallize from magma is;
Feldspars continually react with magma and change composition but stay as feldspar whereas iron - magnesium react with magma and change into other minerals.
- In Bowen's reaction series, feldspar minerals tend to continually change composition, whereas iron - magnesium minerals tend to have an abrupt change of their mineral types.
- Now, the feldspars that are formed from cooling of magnma are usually very rich in calcium. Thus, as cooling continues, the feldspars will start reacting with the magma and as such the feldspar composition will undergo some changes. This reaction will lead to zoned crystals that have outer layers very rich in sodium while the core is very rich in calcium.
- For the iron - magnesium minerals, when magma starts to cool, a mineral will now start to crystallize but the more the magma cools the more the temperature drops and a whole new mineral will be formed.
- Finally, the minerals formed initially reacts with the magma which makes it to be converted into the new mineral.
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