Examples (from class): Quartz, Talc, Halite, Magnetite, Feldspar, Mica, Diamond, Gold, Silver 3. From what are rocks made? Rocks are made from two or more minerals. 4. What is the hardest mineral? Diamond 5. What is the softest mineral? Talc 6. What are the three different types of rocks? Explain how each is formed and give an example of each type.