**1. Introduction**

Anorthosites can give us great information about Earth history and how it was evolved. They can be divided into few types on earth such as: Archean-age (between 4,000 to 2,500 million years ago) anorthosites, Proterozoic (2.5 billion years ago) anorthosite (also known as massif or massif-type anorthosite) – the most abundant type of anorthosite on Earth, Anorthosite xenoliths in other rocks (often granites, kimberlites, or basalts). Furthermore, Lunar anorthosites constitute the lightcolored areas of the Moon's surface and have been the subject of much research. So, these studies will clarify new facts about planet formation in planetary, too.

Magmatic rocks or Igneous rocks are the dominant rock type that the other two main type rocks (I, e sedimentary and metamorphic rocks) are originated them. These Igneous rocks are formed through the cooling and solidification of magma or lava.

Magma is a natural semi-molten material is existed inside the Earth and magmatism is a commonplace phenomenon in terrestrial planets like the Mars and the Venus and some natural satellites such as the Moon. The high internal heat of planets (more than 700°C) like the Earth causes the volcanism phenomenon in which solid rock are formed by cooling magma which are called lava. Definitely, lava is a viscous material but it can be flowed at great distances before cooling as igneous rocks. It should be reminded that melting is not caused by rising temperature, it can also be generated by pressure decreasing or changing in composition, too.

Magma solidification can occur either below or on the surface of the Earth (Planet surface) which are called as intrusive rocks and extrusive rocks, in turn. Moreover, these Igneous rocks can form via crystallization or without crystallization which are called natural glasses. Intrusive rocks which are formed within Earth's crust can be observed as diverse forms even such as dikes (Magmatic dikes are created by flowing magma into a pre-existing fracture of rock body) or even great Batholiths (Large mass of intrusive igneous rock more than 100 square km in area get formed through cooling magma in the depth of Earth.

Petrologists try to find good information about the conditions of igneous rock formation by study them, for example, Plagioclases are really important to identify the origin and evolution of igneous rocks. Fortunately, Anorthosites are dominantly contained Plagioclase minerals and it seems it would be possible to find the answers of suggested questions about how the earth was at own early history and how other extraterrestrial bodies like the Moon get formed, although, Phanerozoic (The eon from the Cambrian Period to the present) rocks are dominantly exposure in the earth as a more evolved planet and Anorthosites are not abundant in the Earth. In a simpler language, these studies will help scientists to make a good planetary formation model which will be vitally important at space exploration time within the solar system or beyond it through the galaxy, or even in astrobiology studies.
