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The foundation of a great rock collection is to identify your rocks by type. Geologist classify rocks into three basic groups based on how they were formed in nature. The types of rocks are: 1  Igneous.2  Sedimentary.etamorphic rocks are formed when sedimentary or igneous rocks are exposed to conditions of very high pressure or temperature, or are exposed to large amounts of very hot water. Slate is formed when fine-grained sedimentary rock (shale) is buried and exposed to high pressure deep beneath the Earth's surface.
Click here for a printable version. Title: Rocks and Their Uses Level: K-12Day/Time: Academic ExpectationsCore Content for Assessment: Objective: Introduce students to different types of rocks and their uses. Background Information: Rocks normally consist of several minerals, some essential, some accessory. A rock may be thought of as a mineral environment.. Each rock type was formed under certain specific conditions, resulting in the formation of a fairly predictable group of minerals. Rocks fall into three classes according to their origin: Igneous-Sedimentary-Metamorphic.