How are minerals formed?

Hint: Minerals are naturally occurring substances with definite physical and chemical properties. MInerals are classified into metallic minerals and nonmetallic minerals depending on their ability to conduct heat and electricity. Metallic minerals are further classified into ferrous and non-ferrous minerals based on their iron content.

Complete answer:
Different minerals are formed under different pressure and temperature conditions.
Igneous or magmatic minerals are formed due to crystallization or cooling down of lava and magma. Muscovite, hornblende , augite and quartz are examples of igneous minerals.
Sedimentary minerals are formed by the process of sedimentation in which raw material is basically the product on another rock that has undergone erosion and weathering. Quartz is commonly found in sandstone, clay is found in mudrocks and even feldspar is abundantly found in sedimentary rocks.
Metamorphic minerals are those which are formed when some other mineral changes its composition when subjected to heat and pressure.Metamorphic minerals include chlorite, epidote, garnet, staurolite, kyanite and sillimanite.
There are hydrothermal minerals where minerals are chemically precipitated from hot solutions within earth. Hydrothermal veins have quarts, calcite, emerald etc.

Note: Minerals that are formed from rapid cooling of magma have finer crystals. Minerals that are formed by gradual cooling of magma have coarse crystals.