A large magma body cools the heavy mineral that crystallize early tend to settle to the lower portion of the magma chamber.that is a type of magmatic segregation is particularly active in large basaltic magmas where chromite, magnetite, and platinum are occasionally gathered. Chromite inter bedded with other heavy minerals are mined from such deposits in the still water complex of Montana. Pegmatites: composed of these large crystals.Most pegmatites are granitic in composition and consist of unusually large crystals of quartz, feldspar and muscovite. Feldspar is used in the production of ceramics and muscovite is used for electrical insulation and glitter.Diamonds is another economically important mineral with an igneous origin.
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