An example of a crystalline rock is

An example of a crystalline rock is granite. Granite is a type of igneous rock that is formed from the slow cooling and solidification of magma deep beneath the Earth's surface. Granite is composed mainly of quartz, feldspar, and mica, which are minerals that have a crystalline structure. The minerals in granite are visible to the naked eye and give the rock its characteristic speckled appearance. Crystalline rocks like granite are formed through a process of crystallization, in which minerals solidify from a liquid or gas into a highly ordered, three-dimensional structure. This gives them a unique set of physical and chemical properties that distinguish them from other types of rocks. Crystalline rocks are found all over the world and have a variety of uses, including as building materials, decorative stones, and sources of minerals and ores. They can also provide important clues about the geological history and evolution of the Earth's crust.