The most valuable rocks are ores. These rocks contain minerals or metals that can be of great commercial value, such as gold, platinum, copper, iron, nickel or silver.Know More
Some elements are found in more than one type of rock, and some rocks contain more than one type of element. Galena, for example, is a major source of lead, but it can also contain silver.
Nickel, a silvery white, shiny metal that has leant its name to an American coin, is found in limonite, which also contains iron. Another nickel ore is pentlandite, which contains iron as well as small amounts of cobalt.
Iron, which is strong, ductile and malleable, is one of the most sought after metals and is inexpensive because it's abundant. This is true even though iron is such a reactive element that it's rarely found in its free state. Among the ores of iron besides those mentioned are hematite, goethite and magnetite. The Earth's core is made of iron, and it's even found in meteors in the form of siderite.
Copper is also found in many types of rocks, especially rocks that are abundant in carbonates, oxides and sulphides. These ores include rocks that have their own esthetic value such as malachite, cuprite and azurite.Learn more about Geology
The most common type of igneous rock, basalt, also known as malfic rock, can be found on oceanic plates at divergent plate boundaries. Intermediate and felsic igneous rocks show up along continental margins, as well. Because igneous rocks form from the cooling of lava and magma, they can be found around areas where volcanic activity is or has been present.Full Answer >
Rocks are different from minerals in that minerals are single crystalline accumulations of one or more elements, while rocks are solid accumulations of one or more minerals. Rock can either refer to a particular, detached object or, in a general sense, as a synonym for stone, generally referring to a portion of the substance. Individual minerals can be obvious in rocks, as with granite, or microscopic, as with many basalts.Full Answer >
Rocks have a broad range of uses that makes them significantly important to human life. For instance, rocks are used in construction, for manufacturing substances and making medicine and for the production of gas. Rocks are also extremely vital to scientists as they provide clues about the Earth’s history.Full Answer >
Conglomerate rocks are formed by the sedimentary rock process, which is: erosion, transport, deposition and cementation. Two characteristic properties of conglomerate rock are that the sedimentary particles, or clasts, are greater than 2 millimeters in size, and the clasts are rounded in appearance. Sedimentary rocks with angular clasts are distinguished from conglomerates and are called breccias.Full Answer >