When the magma cooling of magma its got a igneous rock?
The composition of the magma and the local magnetic flux as it crossed the Curie point.
The rate at which magma cools determines the size of the mineral crystal.
Minerals are formed from magma and lava by when a volcano erupts and the lava or magma cools and then hardens.These types of minerals are therefore harder than other minerals.
it is lava and when lava cools it forms igneous rock