As of magma are produced minerals and rocks?

Igneous rocks are often quite like one another. They are very different color: almost white, yellowish-pink, green, red, brown and black. Some rock solid, like glass, others consist of the visible with the naked eye mineral grains. Understand this question will help us part of the magma. It mainly consists of oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium. For example, if the magma was rich in iron, the color, it is usually dark green or black. If the magma little iron, then its crystallization formed rocks of gray, pink and other bright colors. Deep magmatic rocks are formed at a distance of more than three kilometers from the Earth's surface. They consist of large grains. The size of these grains reaches five centimeters in diameter. Magma, which resulted in the Earth's surface is called - the lava. Quickly ostyvshaya surface lava turns into rock, similar to the cooled dark glass. His so-called - a volcanic glass. Huge masses of lava form a sometimes powerful covers. For example, these basalts. On the island of Iceland basalt layers reaches three thousand feet high and several kilometers long. All foundation Pacific - a huge monolithic basalt bowl. Often, individual arrays of basalts are distinguished kind of structure. Basalt array can be divided into columns with a hexagonal or pentagonal cross-section. So, on the island of Staffa in the west coast of Scotland in Fingal's Cave are thick basalt. An ancient legend says that this cave was carved out a mighty giant to his master - Fingal. In this cave is a huge multi-faceted basalt pillars cover the entire surface of the floor, flooded over a length of 70 meters. Several hundred monolithic columns up to 30 meters form a magnificent architectural ensemble. The cave has a peculiar acoustics. Ore minerals - minerals chromium, nickel, copper and platinum form a rock to dark red. Ore material is accumulated so much that they form a mineral deposit. Starting with light granite and ending with dark, heavy basalt, mixed picture lie before us - the hardened waves and splashes of molten magma.