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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.
The three main types of rocks are: igneous, sedimentary, and metamorphic. Rocks: Mineral Mixtures 8th Grade Section 1:Understanding Rock What exactly is rock? A solid mixture of crystals of one or more minerals, that range in all sizes from pebbles to formations that are thousands of kilometers long.The Value of Rock Rock is an important natural resource.Used by early humans to make tools such as hammers, spears, knives, and scrapers. solid mixture of crystals of one or more minerals, that range in all sizes from pebbles to formations that are thousands of kilometers long. The Value of Rock Rock is an important natural resource. Used by early humans to make tools such as hammers, spears, knives, and scrapers.