According to geology.com, Igneous rocks are formed from the solidification of molten rock material. There are two basic types which are intrusive igneous rocks that solidify below Earth's surface and extrusive igneous rocks that solidify above Earth's surface. For the igneous rock, I chose to do it on Basalt. Basalt is a dark-colored, fine-grained igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as lava flow, but can also form in small intrusive bodies, such as an igneous dike or or a thin sill. The following is a picture of basalt.
The second type of rocks are metamorphic rocks. They are rocks that have been modified by heat, pressure and chemical process usually while buried deep below Earth's surface. Exposure to these extreme conditions has altered the mineralogy, texture and chemical composition of the rocks. There are two types of metamorphic rocks, which are foliated metamorphic rocks, and non-foliated metamorphic rocks. The metamorphic rock I chose for today's lab is quartzite, which is a non-foliated metamorphic rock that is produced by the metamorphism of sandstone. It is composed primarily of quartz. The following picture is a picture of quartzite:
The last type of rock which I am going to talk about is the sedimentary rock. Sedimentary rocks are formed by the accumulation of sediments. There are three types, which are clastic sedimentary that are formed from mechanical weathering debris, chemical sedimentary rocks that form when dissolved material precipitate from solution, and finally, organic sedimentary rocks which form from the accumulation of plant or animal debris. I chose coal, which is an organic sedimentary rock that forms from the accumulation and preservation of plant materials, usually in a swamp environment. The following is a picture of a coal rock.
All of those information were found on www.geology.com
