The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface. Granite. ; Sienite (plutonic): it is distinguished from granite because it does not contain quartz. Komatiite is a very rare and old extrusive igneous rock. An extrusive igneous rocks definition states these rocks form when magma "exits and cools above (or very near) the Earth's surface." Porphyry (plutonic): dark red. Examples of igneous rocks . This is a hard igneous rock made up of clearly visible crystals of various minerals. This igneous rock type is identified by its dark shade and fine-grained texture. Composed of quartz, potassium feldspar and mica. Sliding Rocks. Pumice stone that is used for various purposes is perhaps the example of the lightest igneous rock on planet earth. Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. Key Terms Felsic : Derived from the words feldspar and silica to describe an igneous rock having abundant light-colored minerals such as quartz, feldspars, or muscovite. Composed of feldspar and quartz. Igneous Rocks: Examples and Uses. Sliding Rocks on Racetrack Playa How they slide across a dry lake bed is a mystery. Gabbro (plutonic): thick texture. These rocks are rich in certain types of minerals that help in plants to grow properly. The Brewery Rock ? Examples … Granite. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Examples of aphanitic igneous rock include basalt, andesite andrhyolite. Glassy or vitreous textures occur during some volcanic eruptions when the lava is quenched so rapidly that crystallization cannot occur. It consists of calcium plagioclase, pyroxene, olivine, hornblende and Hypersthene. Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies. Granite (plutonic): gray or light red. Let us look at some examples of igneous rocks. Examples of extrusive igneous rocks include basalt, andesite, rhyolite, dacite, obsidian, pumice and scoria. The Rock Used to Make Beer - Geologists are beer experts and should know about this rock. Basalt. The moon that rotates the earth is also made of igneous rocks. This page reveals the different ways in which types of igneous rock can be used. Trap Rock is a name applied to any dark-colored igneous rock used to produce crushed stone. Rocks September 14, 2011 . Examples of phaneritic igneous rocks are gabbro, diorite and granite. Most of the basaltic rocks are volcanic or extrusive, while intrusive basalt is formed very rarely. The result is a natural amorphous glass with few or no crystals. Igneous rock is a Latin word that means hot or molten rock that crystallizes and solidifies in the following shape: (Image to be added soon) The Earth’s crust is made up of different types of rocks , the rock that makes up the maximum volume of Earth’s crust is called the Igneous rocks. The following are some examples of commonly found igneous rocks and their uses. There are also evidences for presence of basaltic rock in the moon and mars. Igneous rocks are classified into two groups depending upon where the molten rock solidifies: Extrusive or Intrusive. Porphyritic textures develop when conditions during cooling of a magma change relatively quickly.